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Build Your Own Visually

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 / Explorer Watch Case - 39mm
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm - Explorer Case - Brushed Oyster - NH [Solid] - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 39mm

    Explorer Watch Case - 39mm

    $25 SGD - $329 SGD
    Case
    Bracelet
    Caseback (Fits Movement Types)
    Worldwide
    Delivery         Express
    2–4 Days         Replies In
    1 Day         30-Day
    Returns

    The 39mm Explorer — Sapphire, Crown and Bracelet, Built to Finish a Build.

    A classic Explorer that has stood the test of time — the 39mm Explorer Watch Case is an easy, satisfying way to finish a build. It comes complete with a clear-AR sapphire, a screw-down crown, and the option of a solid brushed Oyster bracelet.

    The Oyster clasp includes micro-adjustment, so you can fine-tune the fit without adding or removing links. It also takes Swiss ETA and Sellita movements with the right spacer and caseback.

    Designed to fit all our 28.5mm dials on the grey dial holding spacer — no chapter ring needed. Tested to 200m.

    Sapphire, crown and bracelet — the most complete Explorer.
    Crystal pressed, crown fitted, Oyster bracelet ready. Add a dial, hands and movement and you have a finished watch. No chapter ring required.

    Classic 39mm Explorer.
    Diameter 39mm, case length 46.5mm, 20mm lugs. The proportions that make the Explorer such a reliable finisher.

    Oyster bracelet with micro-adjust.
    Optional solid brushed Oyster bracelet, 20mm tapering to 18mm, with a micro-adjustment clasp — no link removal needed to dial in the fit.

    Seats dials on the holding spacer.
    No chapter ring required — our 28.5mm dials seat on the grey dial holding spacer. Simple to build.

    Swiss-capable, sapphire and crown included.
    Fits NH35/36/38 plus Swiss ETA2824, ETA2893 and Sellita SW200, SW260, SW330. Flat sapphire (29.5 × 1.5mm, clear AR) and screw-down crown included. Rated to 200m.

    Caseback Total Thickness Water Resistance Best for
    Solid 11.5mm 200m / 20 ATM Slimmest profile, fully closed back
    Sapphire (exhibition) 12mm 200m / 20 ATM Show off a decorated movement

    The caseback also matches your movement family — Seiko NH, Swiss ETA2824/2893, or Sellita SW200/260/330 — and ships with the matching movement spacer for your selection.

    Heads up — sold separately

    Dial, hands & movement. Chosen separately. Match the dial and hands to your movement (date / day-date / no-date).

    Sapphire crystal and screw-down crown are included; the Oyster bracelet is included when selected. No chapter ring needed — dials seat on the grey dial holding spacer.

    • Dimensions

      1. Case Diameter 39mm
      2. Case Thickness 11.5mm (solid caseback) / 12mm (sapphire caseback)
      3. Case Length 46.5mm
      4. Bracelet Width 20mm tapering to 18mm
      5. Lug Width 20mm

      Materials & Finish

      1. Quality Swiss Production Quality, ISO 9001 Certified
      2. Case Material 316L Stainless Steel
      3. Crystal Flat sapphire, clear anti-reflective coating (pre-installed)
      4. Crystal Size 29.5mm × 1.5mm
      5. Caseback Screw-down — mirror polished or sapphire
      6. Crown Screw-down, included

      Compatibility

      1. Movements Seiko NH35, NH36, NH38 · Swiss ETA2824, ETA2893 · Sellita SW200, SW260, SW330
      2. Dials 28.5mm — fits all our dials (seats on the grey dial holding spacer; no chapter ring)
      3. Bracelet Solid brushed Oyster, 20→18mm, micro-adjust clasp (per selection)

      Water Resistance

      1. Water Resistant 200m / 20 ATM

    • One of the simplest builds we offer: sapphire, crown and (optionally) the Oyster bracelet are already handled. No chapter ring needed — just add a dial, hands and movement.

      What's already in this purchase:

      The watch case with flat sapphire crystal and screw-down crown installed, your selected Oyster bracelet (if chosen), and your selected NH caseback (plus the matching Swiss spacers/casebacks if you choose an ETA or Sellita movement).

      The 3 parts you'll need for a complete watch:

      1. Dial (28.5mm) Seats on the grey dial holding spacer — no chapter ring required. Match it to your movement.
      2. Hands Paired with your dial.
      3. Movement NH35/36/38, or a Swiss ETA/Sellita with the matching caseback.

      Optional finishing touches:

      1. Decorated bridge + rotor (only visible with a sapphire caseback) — replace the stock NH bridge and rotor with our Côtes de Genève decorated set, viewable through the caseback. Our bridges fit only our rotors (not OEM Seiko rotors), so they’re chosen as a pair. Recommended for experienced modders only.

      Want it built for you?

      Tick the Assemble Watch option above and we’ll handle the full build in our Singapore workshop — case fitting, movement seating, crown alignment, caseback press and a function check.

      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 (sapphire crystal and screw-down crown installed)
      2. 1x Oyster Bracelet (per selection)
      3. 1x NH Caseback (per selection)
      4. 1x ETA2824/SW200/SW260 Movement Spacer (only if that movement is selected)
      5. 1x ETA2893/SW330 Movement Spacer (only if that movement is selected)
      6. 1x ETA2824/SW200/SW260 Sapphire Caseback (only if that movement is selected)
      7. 1x ETA2893/SW330 Sapphire Caseback (only if that movement is selected)

      Dial, hands and movement are selected separately to complete your build.

      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 Explorer Watch Case 39mm v2?

    Seiko NH35, NH36 and NH38, plus Swiss ETA2824 and ETA2893, and Sellita SW200, SW260 and SW330 — set by the caseback you pick, with the matching spacer and caseback supplied. Dials seat on the grey dial holding spacer, so no chapter ring is needed. Dial, hands and movement are chosen separately.

    Which caseback should I choose for the Explorer Watch Case 39mm v2?

    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 11.5mm, or the sapphire (exhibition) caseback at 12mm. Either is rated to 200m / 20 ATM.

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