{"product_id":"gs-watch-case-39mm-ultra-thin-edition-nh34-ready","title":"GS 39mm — Ultra Thin NH34-Ready Watch Case","description":"\u003c!-- split --\u003e\n\u003cdiv class=\"row\" style=\"background-color: #faf7f2; padding: 32px; margin-top: 0;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cem\u003e\u003cstrong\u003eThe GS Dress Case. Faceted Lines, 39mm. Now Ultra Thin.\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThe \u003cstrong\u003eGS Watch Case 39mm\u003c\/strong\u003e is the newest addition to our Ultra Thin Edition — and the largest case the line has ever carried. A clean dress case in the Grand Seiko idiom: sharp facets, dial-forward proportions, and surfaces that alternate between \u003cstrong\u003elinear brushing and mirror polish\u003c\/strong\u003e — bezel top and lug faces brushed, every bevel and flank mirrored, so the case throws a hard line of light exactly where the two meet.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eGetting a 39mm GS into Ultra Thin architecture meant re-engineering every internal dimension to compress case height without giving up structure. The result is \u003cstrong\u003e10.95mm total\u003c\/strong\u003e in solid 316L stainless steel — a full \u003cstrong\u003e1.85mm slimmer\u003c\/strong\u003e than the GS 39mm it replaces, with none of the diameter given back.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThen the twist. Despite the slim profile, this case is \u003cstrong\u003efully NH34-ready\u003c\/strong\u003e — it takes a GMT movement. Fitting a GMT caliber into a sub-11mm case is an extraordinary engineering feat, and it means you can build something genuinely uncommon: a large, thin, faceted GMT.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center; margin-top: 20px; padding-top: 18px; border-top: 1px dashed #999;\"\u003e\u003cem\u003e\u003cstrong style=\"color: #0abab5;\"\u003eSapphire pre-installed. Ready to assemble.\u003c\/strong\u003e\u003cbr\u003eThe double-domed sapphire crystal is the trickiest part of a slim build to seat — so we've done it for you. It ships \u003cstrong\u003epre-installed and aligned\u003c\/strong\u003e at our workshop, no crystal-pressing, no fitment guesswork. Our biggest Ultra Thin case, ready for your dial.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"eight columns alpha\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: #0abab5;\"\u003eOur largest Ultra Thin — 39mm.\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cem\u003eCase diameter 39mm, lug-to-lug 46.5mm, lug width 20mm. The Ultra Thin Edition used to stop at 38mm; this is the case for anyone who wanted the slim architecture with real wrist presence. The line now runs 33mm to 39mm.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: #0abab5;\"\u003eGenuinely thin.\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cem\u003e10.95mm total with the solid caseback, including crystal. The engineering behind that number: a standard NH movement is 7.59mm tall on its own — the NH34 GMT, 7.99mm. That leaves barely 3mm for the crystal, caseback floor, walls and hand clearance combined. The NH is a big movement; compressing one into this profile is the whole challenge.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"eight columns omega\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: #0abab5;\"\u003eGMT-capable — the uncommon build.\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cem\u003eFully NH34-ready. Most slim cases can't take a GMT movement; this one does, without giving up the profile. A thin 39mm faceted GMT is a build few modders can make.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: #0abab5;\"\u003eHalf brushed, half mirror.\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cem\u003eThe finishing is where a GS case is won or lost. The bezel top face and the lug surfaces are linear-brushed; the bevels, flanks and corner facets are mirror-polished. Every edge between the two is a crisp line, not a fade — which is exactly why the case reads sharp in the light. Our \u003ca href=\"\/products\/gs-bracelet-20-16mm\" title=\"GS Bracelet 20\/16mm\" target=\"_blank\"\u003eGS Bracelet \u003cspan class=\"glyphicon glyphicon-new-window\"\u003e\u003c\/span\u003e\u003c\/a\u003e is finished the same way, so the two read as one piece.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; margin-top: 10px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #1a1a1a; color: #ffffff;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eCaseback\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: center;\"\u003eTotal Thickness\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: center;\"\u003eWater Resistance\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eBest for\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #f0fafa; border-left: 4px solid #0abab5;\"\u003e\n\u003ctd style=\"padding: 12px;\"\u003e\n\u003cstrong\u003eSolid\u003c\/strong\u003e \u003cspan style=\"color: #0abab5; font-size: 11px; font-weight: bold;\"\u003e · HEADLINE BUILD\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; text-align: center;\"\u003e\u003cstrong\u003e10.95mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; text-align: center;\"\u003e100m \/ 10 ATM\u003c\/td\u003e\n\u003ctd style=\"padding: 12px;\"\u003eThe thinnest profile — daily and formal wear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #e5e5e5;\"\u003e\n\u003ctd style=\"padding: 12px;\"\u003e\u003cstrong\u003eSapphire\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; text-align: center;\"\u003e11.75mm\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; text-align: center;\"\u003e100m \/ 10 ATM\u003c\/td\u003e\n\u003ctd style=\"padding: 12px;\"\u003eMovement display — show off the rotor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"margin-top: 12px; font-size: 13px; color: #555;\"\u003e\u003cem\u003eThe solid caseback is the headline build — this is the case at its slimmest. The sapphire caseback adds 0.8mm in exchange for a view of the NH movement.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cp style=\"text-align: center; margin-bottom: 6px; margin-top: 24px;\"\u003e\u003cstrong\u003eThe GS case family — find your size\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; margin-top: 6px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #1a1a1a; color: #ffffff;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eCase\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: center;\"\u003eDiameter\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: center;\"\u003eThickness\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eCharacter\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #f0fafa; border-left: 4px solid #0abab5;\"\u003e\n\u003ctd style=\"padding: 12px;\"\u003e\n\u003cstrong\u003eGS 39mm Ultra Thin\u003c\/strong\u003e \u003cspan style=\"color: #0abab5; font-size: 11px; font-weight: bold;\"\u003e · YOU'RE VIEWING THIS\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; text-align: center;\"\u003e39mm\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; text-align: center;\"\u003e10.95mm\u003c\/td\u003e\n\u003ctd style=\"padding: 12px;\"\u003eFaceted dress case, largest — NH34 GMT-ready\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #e5e5e5;\"\u003e\n\u003ctd style=\"padding: 12px;\"\u003e\u003ca href=\"\/products\/62gs-watch-case-36mm-ultra-thin-edition-nh34-ready\" target=\"_blank\"\u003e\u003cstrong\u003e62GS 36mm Ultra Thin\u003c\/strong\u003e \u003cspan class=\"glyphicon glyphicon-new-window\"\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; text-align: center;\"\u003e36mm\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; text-align: center;\"\u003e11.3mm\u003c\/td\u003e\n\u003ctd style=\"padding: 12px;\"\u003eBezel-less GS, crown at 4 — NH34 GMT-ready\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #e5e5e5;\"\u003e\n\u003ctd style=\"padding: 12px;\"\u003e\u003ca href=\"\/products\/gs-diver-watch-case-36mm-nh34-ready\" target=\"_blank\"\u003e\u003cstrong\u003eGS Diver 36mm\u003c\/strong\u003e \u003cspan class=\"glyphicon glyphicon-new-window\"\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; text-align: center;\"\u003e36mm\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; text-align: center;\"\u003e12.5mm\u003c\/td\u003e\n\u003ctd style=\"padding: 12px;\"\u003eDive-styled GS, 200m rated — NH34 GMT-ready\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #e5e5e5;\"\u003e\n\u003ctd style=\"padding: 12px;\"\u003e\u003ca href=\"\/products\/gs-watch-case-36mm-v2\" target=\"_blank\"\u003e\u003cstrong\u003eGS 36mm v2\u003c\/strong\u003e \u003cspan class=\"glyphicon glyphicon-new-window\"\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; text-align: center;\"\u003e36mm\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; text-align: center;\"\u003e12.8mm\u003c\/td\u003e\n\u003ctd style=\"padding: 12px;\"\u003eFaceted dress case, classic mid-size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"margin-top: 12px; font-size: 13px; color: #555;\"\u003e\u003cem\u003eAll four share the GS design language — 316L steel, a double-domed sapphire pre-installed, 28.5mm dials, an SKX013 chapter ring, and a 20mm bracelet or strap. Thickness shown is with the \u003cstrong\u003esolid caseback\u003c\/strong\u003e; a sapphire caseback adds 0.5–0.9mm. The GS 39mm and 62GS 36mm are built on our Ultra Thin architecture — and the GS 36mm v2 is the one case here that is \u003cstrong\u003enot\u003c\/strong\u003e NH34 GMT-ready.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\" style=\"background-color: #f4f4f4; padding: 20px; border-left: 4px solid #0abab5; margin-top: 20px;\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"glyphicon glyphicon-info-sign\"\u003e\u003c\/span\u003e Heads up — sold separately\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"font-size: 14px; margin-bottom: 10px;\"\u003e\u003cem\u003e\u003cstrong\u003eCrown.\u003c\/strong\u003e The crown shown in product photos is for visual reference only. Crowns must be selected above. \u003ca href=\"\/collections\/crowns\" title=\"SKX-compatible crowns\" target=\"_blank\"\u003eBrowse compatible crowns \u003cspan class=\"glyphicon glyphicon-new-window\"\u003e\u003c\/span\u003e\u003c\/a\u003e.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp style=\"font-size: 14px; margin-bottom: 0;\"\u003e\u003cem\u003e\u003cstrong\u003eChapter ring.\u003c\/strong\u003e This case requires a \u003cstrong\u003eSKX013-spec chapter ring\u003c\/strong\u003e to seat the dial correctly — without it, the dial sits too low and hands won't clear. The case \u003cstrong\u003efits both normal and ultra thin chapter rings\u003c\/strong\u003e; the choice depends on your \u003cstrong\u003edial\u003c\/strong\u003e, not the case. If your dial has applied (raised) indices, choose ultra thin for clearance. If flat-printed, either works. \u003cstrong\u003eWhen in doubt, ultra thin is the safer default.\u003c\/strong\u003e \u003ca href=\"\/collections\/chapter-rings-swiss-quality-seiko-mod-parts\/skx013?sort_by=title-ascending\" title=\"SKX013-compatible chapter rings\" target=\"_blank\"\u003eBrowse compatible chapter rings \u003cspan class=\"glyphicon glyphicon-new-window\"\u003e\u003c\/span\u003e\u003c\/a\u003e.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\" style=\"background-color: #fff5f5; padding: 18px; border-left: 4px solid #ff2a00; margin-top: 12px;\"\u003e\n\u003cp\u003e\u003cstrong style=\"color: #ff2a00;\"\u003e\u003cspan class=\"glyphicon glyphicon-warning-sign\"\u003e\u003c\/span\u003e For experienced modders only — TYPE M movements only\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"font-size: 14px; margin-bottom: 10px; color: #7a1f1f;\"\u003e\u003cem\u003eThis case fits \u003cstrong\u003eTYPE M\u003c\/strong\u003e versions of NH34, NH35, NH36, NH38, NH70, NH71, NH72 only. \u003cstrong\u003eTYPE L will NOT fit.\u003c\/strong\u003e Due to tight clearance between hands and sapphire, this case is recommended only for professional watchmakers and experienced modders.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp style=\"font-size: 14px; margin-bottom: 0; color: #7a1f1f;\"\u003e\u003cem\u003e\u003cstrong\u003eNH34 \/ GMT builds:\u003c\/strong\u003e for optimal second-hand clearance, the second hand must be under 12mm in length — or use a second-hand cap. Confirm before assembly.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli\u003e\u003ca class=\"active\" href=\"#tab1\"\u003eSpecs\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"#tab2\"\u003eBuild Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"#tab3\"\u003eWhat's Included\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"#tab5\"\u003eHow To Mod\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli style=\"list-style-type: none;\" class=\"active\" id=\"tab1\"\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eCase Diameter\u003c\/strong\u003e 39mm\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eCase Thickness\u003c\/strong\u003e 10.95mm (Solid Caseback) \/ 11.75mm (Sapphire Caseback)\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eLug to Lug\u003c\/strong\u003e 46.5mm\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eLug Width\u003c\/strong\u003e 20mm\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eMaterials \u0026amp; Finish\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eQuality\u003c\/strong\u003e Swiss Production Quality, ISO 9001 Certified\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eCase Material\u003c\/strong\u003e 316L Stainless Steel\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eCase Finishing\u003c\/strong\u003e Alternating linear brushing and mirror polish — brushed bezel top and lug surfaces, mirror-polished bevels, flanks and corner facets\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eBezel\u003c\/strong\u003e Slim, with a linear-brushed top face\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eCrystal\u003c\/strong\u003e Double-domed sapphire with clear anti-reflective coating\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eCrystal Size\u003c\/strong\u003e 29.5mm x 1.8mm x 1mm\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eCrown\u003c\/strong\u003e Screw-down, SKX-style compatible\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eMovements\u003c\/strong\u003e TYPE M: NH34, NH35, NH36, NH38, NH70, NH71, NH72\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eDials\u003c\/strong\u003e 28.5mm\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eChapter Rings\u003c\/strong\u003e SKX013-spec (required, sold separately)\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eHands\u003c\/strong\u003e NH movement compatible\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eCrowns\u003c\/strong\u003e SKX-style\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eBracelets \u0026amp; Straps\u003c\/strong\u003e 20mm lug — \u003ca href=\"\/products\/gs-bracelet-20-16mm\" title=\"GS Bracelet 20\/16mm\" target=\"_blank\"\u003eGS Bracelet 20\/16mm \u003cspan class=\"glyphicon glyphicon-new-window\"\u003e\u003c\/span\u003e\u003c\/a\u003e recommended for this build\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eWater Resistance\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eSolid \u0026amp; Sapphire Caseback\u003c\/strong\u003e 100m \/ 10 ATM\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/li\u003e\n\u003cli id=\"tab2\"\u003e\n\u003cp\u003e\u003cem\u003eNew to Seiko modding? Here's everything you'll need for a complete, functioning watch — in the order you'd actually assemble it.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's already in this purchase:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe case body with pre-installed double-domed sapphire crystal, and your chosen caseback. That's the foundation. Everything below is what you'll add to make a wrist-ready watch.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe 5 parts you'll need for a complete watch:\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eChapter ring\u003c\/strong\u003e — required first. The chapter ring seats the dial at the correct height; without it, the dial sits too low and the hands won't clear.\u003cbr\u003e\u003cem\u003e(SKX013-spec — sold on a separate page. See the \"sold separately\" panel above for normal vs ultra thin guidance.)\u003c\/em\u003e\u003cbr\u003e\u003ca href=\"\/collections\/chapter-rings-swiss-quality-seiko-mod-parts\/skx013?sort_by=title-ascending\" target=\"_blank\" title=\"SKX013-compatible chapter rings\"\u003eBrowse compatible chapter rings \u003cspan class=\"glyphicon glyphicon-new-window\"\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrown\u003c\/strong\u003e — SKX-style options. Pick a style that matches the watch's character.\u003cbr\u003e\u003cem\u003e(Required to add to cart. Selected from the dropdown above on this page.)\u003c\/em\u003e\u003cbr\u003e\u003ca href=\"\/collections\/crowns\" target=\"_blank\" title=\"SKX-compatible crowns\"\u003eBrowse compatible crowns \u003cspan class=\"glyphicon glyphicon-new-window\"\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDial\u003c\/strong\u003e (28.5mm) — the face of the watch. The biggest aesthetic choice you'll make. Match it to your chosen movement (date \/ day+date \/ GMT \/ no-date dial).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHands\u003c\/strong\u003e — paired with your dial. Most modders match lume colour across both hands and dial markers (BGW9 white-blue, C3 green, etc.). For NH34 GMT builds, you'll also need a GMT hand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMovement\u003c\/strong\u003e — NH34 (GMT), NH35 (date), NH36 (day+date), NH38 (no date), or source your own. The movement is the engine of the watch.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eOptional finishing touches:\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eBracelet or strap\u003c\/strong\u003e \u003cem\u003e(20mm lug)\u003c\/em\u003e — we recommend our \u003ca href=\"\/products\/gs-bracelet-20-16mm\" title=\"GS Bracelet 20\/16mm\" target=\"_blank\"\u003eGS Bracelet 20\/16mm \u003cspan class=\"glyphicon glyphicon-new-window\"\u003e\u003c\/span\u003e\u003c\/a\u003e, finished with the same alternating brushed and polished surfaces as the case, plus custom shell cordovan \/ full-grain cowhide leather straps.\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\n\u003cstrong\u003eDecorated bridge + rotor\u003c\/strong\u003e \u003cem\u003e(only visible with sapphire caseback)\u003c\/em\u003e — replace the stock NH movement bridge and rotor with our Côtes de Genève decorated set, viewable through the sapphire caseback. Note: our bridges fit only our rotors (not OEM Seiko rotors), so they're chosen as a pair. \u003cem\u003eRecommended for experienced modders only — or tick Assemble Watch below and we'll handle it.\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eWant it built for you?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTick the \u003cstrong\u003eAssemble Watch (+SGD $50)\u003c\/strong\u003e option above on this page and we'll handle the full build in our Singapore workshop — case fitting, movement seating, crown alignment, caseback press, function check, and decorated bridge + rotor installation if you've added those.\u003c\/p\u003e\n\u003cp style=\"font-size: 13px; color: #555;\"\u003e\u003cem\u003eHeads up: assembled watches require \u003cstrong\u003e2–5 business days of workshop time\u003c\/strong\u003e before shipping.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp style=\"font-size: 13px; margin-top: 16px; padding-top: 12px; border-top: 1px dashed #ccc;\"\u003e\u003cem\u003eOnce your parts arrive, see the \u003cstrong\u003eHow To Mod\u003c\/strong\u003e tab for assembly tutorials.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli id=\"tab3\"\u003e\n\u003col\u003e\n\u003cli type=\"disc\"\u003e1x Watch Case Body (with pre-installed double-domed sapphire crystal)\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e1x NH Caseback (Solid or Sapphire, per selection)\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff9900;\"\u003e\u003cem\u003eAll photos of watches with modification parts are for illustration purposes only and are not included with the case purchase.\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli id=\"tab5\"\u003e\n\u003col\u003e\n\u003cli type=\"disc\"\u003e\u003ca title=\"TUTORIAL - How To Mod Your SEIKO Watch Dial \u0026amp; Hands by Lucius Atelier\" href=\"\/blogs\/news\/tutorial-how-to-modify-your-seiko-watch-dial-and-hands\" target=\"_blank\"\u003eA Complete Guide On How To Mod Your SEIKO Watch Dial And Hands (Photos \u0026amp; Video) \u003cspan class=\"glyphicon glyphicon-new-window\"\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\u003ca title=\"TIPS - Learn about fitting dials with four dial legs by Lucius Atelier\" href=\"\/blogs\/news\/tips-learn-about-fitting-dials-with-four-dial-legs\" target=\"_blank\"\u003eFitting dials with four dial legs \u003cspan class=\"glyphicon glyphicon-new-window\"\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli type=\"disc\"\u003e\u003ca href=\"\/blogs\/news\/seiko-watch-modding-101\" target=\"_blank\"\u003eSeiko Modding: The Complete Build Guide (2026) \u003cspan class=\"glyphicon glyphicon-new-window\"\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lucius Atelier","offers":[{"title":"Solid","offer_id":48175365914860,"sku":"GS39UT\/NH.Solid","price":120.0,"currency_code":"SGD","in_stock":true},{"title":"Sapphire","offer_id":48175365947628,"sku":"GS39UT\/NH.Sapp","price":145.0,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/0386\/3612\/files\/grand-seiko-watch-case-39mm-v3-UTE-_1.jpg?v=1786856216","url":"https:\/\/luciusatelier.com\/products\/gs-watch-case-39mm-ultra-thin-edition-nh34-ready","provider":"Lucius Atelier","version":"1.0","type":"link"}