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SKX013 Diver 38 Black Ultra Thin Edition — side profile showing 10.86mm ultra-thin case thickness

Ultra Thin Edition
Seikonaut Bracelet 20/16mm [TITANIUM] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

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  • SKX013 Diver 38 Black Ultra Thin Edition — side profile showing 10.86mm ultra-thin case thickness

    Ultra Thin Edition
  • Seikonaut Bracelet 20/16mm [TITANIUM] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

    Seikonaut
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    Home / All Products / 1908 36mm Yellow Gold — Ultra Thin NH34-Ready Watch Case
    1908 Watch Case - 36mm - Yellow Gold [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    1908 Watch Case - 36mm - Yellow Gold [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    1908 Watch Case - 36mm - Yellow Gold [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    1908 Watch Case - 36mm - Yellow Gold [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    1908 Watch Case - 36mm - Yellow Gold [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    1908 Watch Case - 36mm - Yellow Gold [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    1908 Watch Case - 36mm - Yellow Gold [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    1908 Watch Case - 36mm - Yellow Gold [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    1908 Watch Case - 36mm - Yellow Gold [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    1908 Watch Case - 36mm - Yellow Gold [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    New

    1908 36mm Yellow Gold — Ultra Thin NH34-Ready Watch Case

    $145 SGD - $170 SGD
    Caseback
    Worldwide
    Delivery         Express
    2–4 Days         Replies In
    1 Day         30-Day
    Returns

    The Dress-Watch Silhouette. Reborn Ultra Thin. Finished in Gold.

    Inspired by the refined sophistication of vintage dress watches, the 1908 Watch Case 36mm Yellow Gold, part of our Ultra Thin Edition series, is our modernised take on classic horology — a fluted, domed bezel that catches light from every angle, paired with a double-domed sapphire that follows the curve for a sleek, uninterrupted profile.

    The difference here is the finish. A rich PVD yellow gold coating over solid 316L stainless steel — high-grade Physical Vapor Deposition for genuine resistance to wear and fading, not a finish that rubs off. It turns a dress case into an unmistakably opulent one.

    Achieving a genuinely slim profile meant building on our Ultra Thin engineering: every internal dimension was re-engineered to compress case height without compromising structure. The result is a sub-11mm dress case — formal enough for a cuff, compact enough for any wrist.

    Then the twist. Despite the dressy proportions, this case is fully NH34-ready — it takes a GMT movement. Fitting a GMT caliber into a sub-11mm dress case is an extraordinary engineering feat, and it means you can build something genuinely uncommon: a thin, formal, gold GMT.

    Sapphire pre-installed. Ready to assemble.
    The double-domed sapphire crystal is the trickiest part of a domed build to seat — so we've done it for you. It ships pre-installed and aligned at our workshop, no crystal-pressing, no fitment guesswork. A formal watch that's genuinely yours — down to the millimetre.

    Wears 36, dresses up.
    Case diameter 36mm, lug-to-lug 43mm, lug width 20mm. Classic dress-watch proportions that sit beautifully on wrists of all sizes — and slip under a shirt cuff the way a formal watch should.

    Genuinely thin.
    10.75mm 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.

    GMT-capable — the uncommon build.
    Fully NH34-ready. Most dress cases can't take a GMT movement; this one does, without giving up the slim profile. A thin formal GMT is a build few modders can make — in gold, fewer still.

    Built for our gold bracelet.
    Designed to pair with our Settimo Bracelet in Yellow Gold — a seven-link PVD gold bracelet engineered around this exact 20/16mm lug profile. The warm, faceted finish is matched to the case.

    Caseback Total Thickness Water Resistance Best for
    Solid · HEADLINE BUILD 10.75mm 100m / 10 ATM The thinnest profile — daily and formal wear
    Sapphire 11.7mm 100m / 10 ATM Movement display — show off the rotor

    The solid caseback is the headline build — this is the case at its slimmest. The sapphire caseback adds slight thickness in exchange for a view of the NH movement. Both casebacks are uncoated steel — see What's Included below.

    Heads up — sold separately

    Crown. The crown shown in product photos is for visual reference only. Crowns must be selected above. Browse compatible crowns .

    Chapter ring. This case requires a SKX013-spec chapter ring to seat the dial correctly — without it, the dial sits too low and hands won't clear. The case fits both normal and ultra thin chapter rings; the choice depends on your dial, not the case. If your dial has applied (raised) indices, choose ultra thin for clearance. If flat-printed, either works. When in doubt, ultra thin is the safer default. Browse compatible chapter rings .

    For experienced modders only — TYPE M movements only

    This case fits TYPE M versions of NH34, NH35, NH36, NH38, NH70, NH71, NH72 only. TYPE L will NOT fit. Due to tight clearance between hands and sapphire, this case is recommended only for professional watchmakers and experienced modders.

    NH34 / GMT builds: for optimal second-hand clearance, the second hand must be under 12mm in length — or use a second-hand cap. Confirm before assembly.

    • Dimensions

      1. Case Diameter 36mm
      2. Case Thickness 10.75mm (Solid Caseback) / 11.7mm (Sapphire Caseback)
      3. Lug to Lug 43mm
      4. Lug Width 20mm

      Materials & Finish

      1. Quality Swiss Production Quality, ISO 9001 Certified
      2. Case Material 316L Stainless Steel
      3. Coating Physical Vapor Deposition (PVD) Yellow Gold
      4. Case Finishing Full mirror polish
      5. Bezel Fluted and domed
      6. Crystal Double-domed sapphire with clear anti-reflective coating
      7. Crystal Size 28.6mm x 1mm x 1.75mm
      8. Crown Screw-down, SKX-style compatible

      Compatibility

      1. Movements TYPE M: NH34, NH35, NH36, NH38, NH70, NH71, NH72
      2. Dials 28.5mm
      3. Chapter Rings SKX013-spec (required, sold separately)
      4. Hands NH movement compatible
      5. Crowns SKX-style
      6. Bracelets 20mm lug — Settimo in Yellow Gold recommended for this build

      Water Resistance

      1. Solid & Sapphire Caseback 100m / 10 ATM

    • New to Seiko modding? Here's everything you'll need for a complete, functioning watch — in the order you'd actually assemble it.

      What's already in this purchase:

      The 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.

      The 5 parts you'll need for a complete watch:

      1. Chapter ring — 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.
        (SKX013-spec — sold on a separate page. See the "sold separately" panel above for normal vs ultra thin guidance.)
        Browse compatible chapter rings
      2. Crown — SKX-style options. Pick a style that matches the watch's character.
        (Required to add to cart. Selected from the dropdown above on this page.)
        Browse compatible crowns
      3. Dial (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).
      4. Hands — 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.
      5. Movement — NH34 (GMT), NH35 (date), NH36 (day+date), NH38 (no date), or source your own. The movement is the engine of the watch.

      Optional finishing touches:

      1. Bracelet or strap (20mm lug) — we recommend our Settimo Bracelet in Yellow Gold to match this case's finish, plus custom shell cordovan / full-grain cowhide leather straps.
      2. Decorated bridge + rotor (only visible with sapphire caseback) — 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. Recommended for experienced modders only — or tick Assemble Watch below and we'll handle it.

      Want it built for you?

      Tick the Assemble Watch (+SGD $50) 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.

      Heads up: assembled watches require 2–5 business days of workshop time before shipping.

      Once your parts arrive, see the How To Mod tab for assembly tutorials.

      1. 1x Watch Case Body in PVD Yellow Gold (with pre-installed double-domed sapphire crystal)
      2. 1x NH Caseback — uncoated steel (Solid or Sapphire, per selection)

      The caseback is supplied in uncoated stainless steel — it sits against the wrist and is not visible when worn.

      All photos of watches with modification parts are for illustration purposes only and are not included with the case purchase.

      1. A Complete Guide On How To Mod Your SEIKO Watch Dial And Hands (Photos & Video)
      2. Fitting dials with four dial legs
      3. Seiko Modding: The Complete Build Guide (2026)

    Questions, Answered

    Everything worth knowing before you build.

    Can this case really take a GMT movement?

    Yes. The 1908 36 Yellow Gold is fully NH34-ready. Fitting a GMT caliber into a sub-11mm dress case is the case's signature engineering feat — it lets you build a thin, formal GMT, which is an uncommon combination in the modding world. Note the second-hand clearance requirement in the warning panel above for NH34 builds.

    How durable is the PVD gold finish?

    The case is solid 316L stainless steel coated with high-grade Physical Vapor Deposition (PVD) gold. PVD is a hard, wear-resistant coating — far more durable than traditional gold plating — and resists scratching and fading under normal wear.

    Is the caseback also gold?

    No — the caseback is supplied in uncoated stainless steel. It sits against the wrist and isn't visible when the watch is worn, so it's left uncoated. The case body, bezel and lugs all carry the full PVD yellow gold finish.

    Which caseback should I choose?

    The solid caseback (10.75mm) is the headline build — this is the case at its thinnest. Choose sapphire (11.7mm) if you want to display the NH movement and rotor through the back. Both are rated 100m / 10 ATM, and both are supplied in uncoated steel.

    What's the difference between Type M and Type L?

    Type M and Type L are Seiko's two factory hand-fitting versions of the NH series. Type L sits higher than Type M — about 0.4mm taller from base to second-hand pinion. Because of the tight clearance between hands and sapphire in Ultra Thin Edition cases, only Type M will fit. Confirm your movement type before ordering.

    Do I need to remove the sapphire crystal to install the chapter ring?

    No — and that's the whole point of us pre-installing the sapphire for you. The chapter ring sits on top of the dial inside the case, not under the crystal, so the crystal stays where it is throughout the build. (If you ever do need to remove the sapphire — for example, to replace it — that's a workshop job we handle for you, not an at-home step.)

    Should I choose the normal or the ultra thin chapter ring?

    The choice depends on your dial, not the case — both sizes fit every Ultra Thin Edition case. If your dial has applied (raised) indices, the ultra thin chapter ring is the better choice because its slimmer profile gives the indices clearance instead of resting on top of them. If your dial is flat-printed (no applied markers), either size works. When in doubt, the ultra thin chapter ring is the safer default because it works with both dial types.

    What is an SKX013 chapter ring and why does it matter?

    A specific size and spec used by Seiko in the SKX013 (discontinued 2019). The LA smaller-case lineup all uses this same spec, which means dozens of chapter ring designs work across every smaller case in the catalogue.

    Will SKX007 dials fit?

    Any 28.5mm dial will fit. Stock SKX007 dials may seat differently because the original SKX007 has a 4 o'clock crown position with offset dial feet, while Ultra Thin Edition cases are designed for 3 o'clock dial feet.

    Does this case need a chapter ring?

    Yes — every Ultra Thin Edition case requires an SKX013-spec chapter ring, sold separately. The chapter ring seats the dial at the correct height; without it, the dial drops and the hands will not clear properly.

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