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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 / Datejust Watch Case - 36mm
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

    Datejust Watch Case - 36mm

    $145 SGD - $249 SGD
    Caseback (Fits Movement Types)
    Worldwide
    Delivery         Express
    2–4 Days         Replies In
    1 Day         30-Day
    Returns

    The Datejust. Fluted Bezel, 36mm. Five Movements, One Case.

    A fluted-bezel dress case in the classic date-window idiom, in a true-to-era 36mm — the Datejust silhouette, ready to build.

    One case, five movement families: Seiko NH, Swiss ETA2824 and ETA2893, Sellita SW200, SW260 and SW330 — chosen by the caseback you select, with spacer and caseback supplied.

    Ships with a flat sapphire crystal pre-installed and a screw-down crown fitted. Built for our 28.5mm dials, an SKX013 chapter ring (mandatory), and NH movements on the grey dial holding spacer.

    Kept slim, this case is not NH34 GMT-ready — there isn't clearance for the 24-hour hand. Run NH35, NH36 or NH38, or a Swiss ETA/Sellita movement.

    Five movements, one case.
    Seiko NH35/36/38, Swiss ETA2824 and ETA2893, Sellita SW200, SW260 and SW330 — selected by caseback, with the spacer and caseback supplied. (Not NH34 — see below.)

    Flat sapphire, already in.
    A flat sapphire with anti-reflective coating, pressed and sealed in our workshop — and a screw-down crown fitted. The crisp, low-profile dress look.

    Date-window dress, 36mm.
    Case 36mm, lug-to-lug 43mm, 20mm lugs — the slimmest of the platform at 11.5mm. Fluted bezel, dial-forward.

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

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

    This case ships with the sapphire crystal pre-installed and a screw-down crown fitted. 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 .

    • Dimensions

      1. Case Diameter 36mm
      2. Case Thickness 11.5mm (Solid Caseback), 12mm (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 Flat Sapphire with Clear Anti-Reflective Coating
      4. Crystal Size 29.5mm x 1.5mm
      5. Crown Screw down

      Compatibility

      1. Movements 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. 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 and a screw-down crown fitted. 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.

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

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

      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 and screw-down crown 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 Datejust Watch Case 36mm?

    Five movement families in one case, set by the caseback you pick: Seiko NH35, NH36, NH38 (and NH72), Swiss ETA2824 and ETA2893, and Sellita SW200, SW260 and SW330. The matching spacer and caseback are supplied. Kept slim, this case is not NH34 GMT-ready — there isn't clearance for the 24-hour hand — so run NH35/36/38 or a Swiss movement.

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

    Pick the caseback matching your movement family — Seiko NH, Swiss ETA2824/2893, or Sellita SW200/260/330 — and the matching spacer and caseback ship with it. Choose solid for the slimmest profile at 11.5mm, or the sapphire (exhibition) caseback at 12mm. This is the slimmest case in the GS platform, with a flat sapphire crystal pre-installed.

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