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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 / SKX Cases / SKX013 Watch Case - 38mm [NH34-Ready]
    SKX013 Watch Case - 38mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Watch Case - 38mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Watch Case - 38mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Watch Case - 38mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Watch Case - 38mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Watch Case - 38mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Watch Case - 38mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Watch Case - 38mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Watch Case - 38mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Watch Case - 38mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

    SKX013 Watch Case - 38mm [NH34-Ready]

    $88 SGD

    The Discontinued Diver. Rebuilt at 38mm. Ready to Mod.

    Our ground-up reinterpretation of the discontinued SKX013 — sized at a wearable 38mm, with drilled-through lugs for that period-correct, tool-free strap-change character.

    Built from the start to take our entire SKX013 mod-parts range, so the final piece is yours to spec. NH34 GMT-ready, and compatible with the full NH movement family.

    Designed to fit all our 28.5mm dials and original NH movements (which seat on the grey dial holding spacer).

    Wears 38, builds big.
    Case diameter 38mm, lug-to-lug 45.5mm, 20mm lugs. Drop in a bezel insert and it carries real wrist presence for its size. See how a small dive case wears bigger .

    Drilled-through lugs.
    Vintage-style drilled lugs — quick, tool-free strap swaps and an honest period look.

    Built to dive.
    200m / 20 ATM, tested. Screw-down crown. Universal springbars.

    Fits the whole SKX013 ecosystem.
    Bezel, insert, sapphire crystal, chapter ring, crown, dial, hands — all from our SKX013 range. 28.5mm dials; NH movements on the grey dial holding spacer.

    The SKX013 case family — find your size

    Case Diameter Lug-to-Lug Character
    SKX013 38mm · YOU'RE VIEWING THIS 38mm 45.5mm Our take on the discontinued SKX013 diver
    SKX013 Submariner 36mm 36mm 45.5mm Vintage sub-style skin-diver
    SKX013 GS Diver 36mm 36mm 44mm GS-style diver, most compact

    All three share the same DNA — 316L steel or DLC black, 200m / 20 ATM, drilled-through lugs, 28.5mm dials, NH movements, and a 20mm bracelet or strap. What differs is size and silhouette.

    This exact case also comes in the DLC Black Edition .

    Heads up — this is the case body. The rest is sold separately.

    This case ships as a bare body (with click spring and gaskets). The bezel, insert, crystal, caseback, chapter ring, crown, dial, hands and movement are chosen separately — it's built to fit our full SKX013 parts range .

    Chapter ring. This case needs an SKX013-spec chapter ring to seat the dial correctly — without it the dial sits too low and the hands won't clear. It takes both normal and ultra thin chapter rings; the choice depends on your dial, not the case. If your dial has applied (raised) indices, pick an ultra thin chapter ring for clearance; a flat-printed dial works with either. Browse SKX013 chapter rings .

    Crown. Screw-down, SKX-style. Browse SKX013 crowns .

    • Dimensions

      1. Case Diameter 38mm
      2. Case Thickness 9mm (case body only, excluding caseback and crystal)
      3. Lug to Lug 45.5mm
      4. Lug Width 20mm

      Materials & Finish

      1. Quality Swiss Production Quality, ISO 9001 Certified
      2. Case Material 316L Stainless Steel
      3. Lugs Drilled-through
      4. Crown Screw down, SKX-style
      5. Springbars Universal

      Compatibility

      1. Movements 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 & Straps Lucius Atelier bracelets and 20mm straps

      Water Resistance

      1. Water Resistant 200m / 20 ATM (tested)

    • New to Seiko modding? You can build the whole watch right here — every part is an Add dropdown on this page. The case ships as a bare body (with the bezel click spring and the crystal & caseback gaskets); you choose the rest and spec it exactly how you like.

      Ten parts make a complete watch. You've got the case — here are the other nine, each a dropdown above, in the order you'd assemble them:

      1. Bezel — the rotating dive bezel. Browse SKX013 bezels .
      2. Bezel insert — the marked ring that sits inside the bezel. Browse inserts .
      3. Caseback — seals the case; solid, or sapphire to show off a decorated movement. Browse SKX013 parts .
      4. Chapter ring (required — seats the dial) — SKX013-spec; without it the dial sits too low and the hands won't clear. Browse chapter rings .
      5. Crown (required) — screw-down, SKX-style. Browse SKX013 crowns .
      6. Crystal — flat sapphire, pressed into the case. Browse SKX013 crystals .
      7. Dial (28.5mm) — match it to your movement: date, day+date, or no-date. Browse dials .
      8. Hands — paired to your dial; most modders match lume colour across hands and markers. Browse hands .
      9. Movement — NH35 (date), NH36 (day+date), NH38 (no date), or fit your own. Browse NH movements .

      Building an NH34 GMT? Add a GMT 24H hand (its own dropdown) and a GMT / NH34-specific dial — the 24-hour hand is the one optional extra on top of the ten.

      Optional extras (also dropdowns above): a 20mm bracelet or leather strap , and a Côtes de Genève decorated bridge + rotor — only visible through a sapphire caseback, and our bridges pair only with our rotors, so pick them together.

      Want it built for you?

      Under ADD, tick Assemble Watch (+SGD $100) and we'll do the full build in our Singapore workshop — crystal press, bezel and insert fit, movement seating, crown alignment, caseback press, and a final function check.

      Heads up: assembled watches need 2–5 business days of workshop time before they ship.

      Prefer to build it yourself? See the How To Mod tab for step-by-step tutorials.

      1. 1x Watch Case Body
      2. 1x Bezel Click Spring
      3. 1x Crystal Gasket
      4. 1x Caseback Gasket

      Springbars are included with our bracelets and straps.

      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.

    Which caseback should I choose for the SKX013 Watch Case 38mm?

    Two SKX013-spec casebacks, both sold separately: a solid caseback for a clean, closed back, or a sapphire (exhibition) caseback that shows off a decorated movement, bridge and rotor. Either keeps the case rated to 200m / 20 ATM. Pick solid for a classic tool-diver look; pick sapphire if you're running a Côtes de Genève bridge and rotor you want on display.

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