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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 / GS Diver Watch Case - 36mm [NH34-Ready]
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

    GS Diver Watch Case - 36mm [NH34-Ready]

    $120 SGD - $224 SGD
    Caseback (Fits Movement Types)
    Worldwide
    Delivery         Express
    2–4 Days         Replies In
    1 Day         30-Day
    Returns

    The GS Diver. 36mm. Sapphire In, Ready to Spec.

    A compact 36mm dive-styled case in the GS idiom — turned-bezel look, screw-down crown, rated to 200m.

    A selectable caseback fits five movement families — Seiko NH, Swiss ETA2824 and ETA2893, Sellita SW200, SW260 and SW330 — with the spacer and caseback supplied for your pick. NH34 GMT-ready.

    Sapphire crystal pre-installed. Designed for our 28.5mm dials, an SKX013 chapter ring and SKX013 crowns, and NH movements on the grey dial holding spacer.

    Five movements, one case.
    Seiko NH, Swiss ETA2824 and ETA2893, Sellita SW200, SW260 and SW330 — chosen by the caseback you pick, with the spacer and caseback supplied. NH34 GMT-ready.

    Sapphire, already in.
    A double-domed sapphire with anti-reflective coating, pressed and sealed in our workshop. The crown is chosen separately.

    Compact dive case, 200m.
    Case 36mm, lug-to-lug 43mm, 20mm lugs. Screw-down crown, tested to 200m / 20 ATM.

    Fits the 28.5mm dial ecosystem.
    28.5mm dials, an SKX013 chapter ring, SKX013 crowns, NH-compatible hands. Pairs with our 20mm bracelets and straps.

    The GS case family — find your size

    Case Diameter Lug-to-Lug Character
    GS Watch Case 39mm v2 39mm 46mm Faceted dress case, largest
    GS Watch Case 36mm v2 36mm 43mm Faceted dress case, classic mid-size
    GS Diver 36mm · YOU'RE VIEWING THIS 36mm 43mm Dive-styled GS, 200m bezel look

    All three are the same GS platform — 316L steel, 200m / 20 ATM, a double-domed sapphire pre-installed, 28.5mm dials, an SKX013 chapter ring, and a 20mm bracelet or strap. The 39 and the Diver are NH34 GMT-ready; the 36mm dress runs NH35/36/38 plus Swiss ETA and Sellita.

    Heads up — what's in the box, and what's sold separately.

    This case ships with the sapphire crystal pre-installed. The dial, hands, chapter ring and movement are chosen separately — build it to fit our full dial range .

    Chapter ring. This case needs an SKX013 chapter ring to seat the dial correctly — it is mandatory and never included. 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 — chosen separately. Browse SKX013 crowns .

    • Dimensions

      1. Case Diameter 36mm
      2. Case Thickness 12.5mm (Solid Caseback), 13mm (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. Crystal Double Domed Sapphire with Clear Anti-Reflective Coating
      4. Crystal Size 29.5mm x 1.5mm x 3mm
      5. Crown Screw down

      Compatibility

      1. Movements NH34, NH35, NH36, NH38, NH72, ETA2824, ETA2893, SW200, SW260, SW330
      2. Dials 28.5mm
      3. Chapter Rings SKX013-spec (required, sold separately)
      4. Hands NH movement compatible
      5. Crowns SKX-style (sold separately)
      6. Bracelets & Straps Lucius Atelier bracelets and 20mm straps

      Water Resistance

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

    • The case ships with the sapphire crystal pressed in. You choose the rest below — every part is an Add dropdown on this page — and the caseback you select sets which movement family the case fits.

      Five more parts make a complete watch, each a dropdown above, in the order you'd assemble them:

      1. Crown (required) — screw-down, SKX-style. Browse SKX013 crowns .
      2. Chapter ring (required — seats the dial) — SKX013-spec; without it the dial sits too low and the hands won't clear. Browse chapter rings .
      3. Dial (28.5mm) — match it to your movement: date, day+date, or no-date. Browse dials .
      4. Hands — paired to your dial; most modders match lume colour across hands and markers. Browse hands .
      5. Movement — a Seiko NH, or a Swiss ETA2824/2893 or Sellita SW200/260/330 (pick the matching caseback above). Browse movements .

      Building an NH34 GMT? Add a GMT 24H hand and a GMT / NH34-specific dial — the 24-hour hand is the one optional extra.

      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 — movement seating, caseback fit, crown alignment, dial and hands, 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 (sapphire crystal installed)
      2. 1x NH Caseback (depends on selection)
      3. 1x ETA2824/SW200/SW260 Movement Spacer (depends on selection)
      4. 1x ETA2893/SW330 Movement Spacer (depends on selection)
      5. 1x ETA2824/SW200/SW260 Sapphire Caseback (depends on selection)
      6. 1x ETA2893/SW330 Sapphire Caseback (depends on selection)

      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 movements fit the GS Diver Watch Case 36mm?

    Five movement families in one case, chosen by the caseback: Seiko NH (NH34/35/36/38/72), Swiss ETA2824 and ETA2893, and Sellita SW200, SW260 and SW330. The matching spacer and caseback are supplied. It's NH34 GMT-ready, so a true GMT build is on the table. Dial, hands, an SKX013 chapter ring and a crown are chosen separately.

    Which caseback should I choose for the GS Diver Watch Case 36mm?

    The caseback matches your movement family (Seiko NH, Swiss ETA2824/2893, or Sellita SW200/260/330) and sets the back style; the matching spacer and caseback ship with it. Choose solid for the slimmest profile at 12.5mm, or the sapphire (exhibition) caseback at 13mm to show the movement. The case is rated 200m / 20 ATM.

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