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    Shell Cordovan Straps

    Ready Made Mods

    We are the pioneer for the development and production of highest quality SEIKO mod parts. We are always innovating and pushing the limits of dial production. Using only 100% Swiss Super-LumiNova® luminous pigments. ISO 9001 Certified.

    Designed By Modders.
    For Modders.

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    Home / SEIKO Mod Parts / Seikonaut Watch Case - 38mm [ULTRA THIN EDITION]
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
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    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION]

    $84 SGD - $102 SGD$120 SGD - $145 SGD
    Caseback

    PRE-ORDER @ 30% Discount
    Estimate release date: 17 Jun 2025
    All orders containing this item will begin shipping on or after this date.

    Engineered by us and made exclusively for us with quality assurance by ISO 9001 Certified manufacturers.

    FREE WORLDWIDE SHIPPING

    BUILD YOUR OWN WATCH!
    6 main components required to complete a watch.
    Watch Case
    Dial
    Crown
    Hands
    Chapter Ring
    Movement
    Bracelet (optional)
    Strap (optional)
    Bridge & Rotor (optional)
    Movement Holder (optional)
    Tweezer (optional)

    HOW TO START?

    • For the watch case, select your (1) Caseback (Solid or sapphire) and the type of (2) Crown you prefer (Browse photos to see crown styles).
    • For a complete watch, select your (3) Dial, (4) Hands, (5) Chapter Ring and (6) Movement.
    • To add bracelet or strap, select your (6) Bracelet or Strap (optional).
    • To decorate movement, select your (7) Bridge and Rotor (optional).
    • To have watch assembled, select (8) Assemble Watch (optional). Please note that assembling the entire timepiece requires 2 to 5 business days prior to shipping.

    A Compact Powerhouse. Ultra Thin. Big Presence.

    Introducing the Ultra Thin Edition of the Seikonaut Watch Case—an iconic reinterpretation of a legendary sports-luxury design, now engineered to be among the thinnest NH-compatible watch cases ever made.

    The Seikonaut aesthetic—defined by its integrated case-bracelet silhouette, angular geometry, and sporty elegance—has achieved cult status in the watch modding world. Coveted for its versatility and bold wrist presence, it seamlessly blends refined design with everyday wearability.

    While the bezel measures 38mm, the case tells a bigger story. Factoring in the flared side flanks, the full case width measures 42mm, and with a 7mm crown installed, reaches approximately 44mm. This size offers a commanding presence while still wearing incredibly balanced—a bold statement piece that looks equally stunning on both small and large wrists.

    Despite its visual strength, the case is remarkably thin:
    • 10.0mm with solid caseback
    • 10.9mm with sapphire caseback

    Considering the NH movement alone is 7.59mm thick, this means your crystal, case walls, and hand clearance add up to just a few millimeters—an impressive feat of engineering and minimalism.

    Crafted from robust 316L stainless steel, this case delivers enduring durability with a sleek brushed finish. Additional flexibility to choose your preferred 7mm crown style—coin-edge, knurled, or onion-style.

    As shown in the photo, titanium version is available .

    IMPORTANT: This case can ONLY fit TYPE M of NH35, NH36, NH38, NH70, NH71 and NH72 movement. TYPE L of these movements will NOT fit. Due to low tolerance/space between hands and sapphire, this case is ONLY recommended for professional watchmakers and highly skilled/experienced modders with great level of finesse.

      1. Quality Swiss Production Quality, ISO 9001 Certified
      2. Case Material 316L Stainless Steel
      3. Bezel Diameter 38mm
      4. Case Width (with flanks) 42mm
      5. Case Width (with crown) 44mm
      6. Case Thickness 10mm (Solid Caseback), 10.9mm (Sapphire Caseback)
      7. Lug to Lug 47mm
      8. Lug Width 20mm
      9. Crown Screw down
      10. Crystal Flat Sapphire with Clear Anti-Reflective Coating
      11. Crystal Size 29.5mm x 1mm
      12. Water Resistant 100m / 10atm
      13. Fit Movements TYPE M: NH35, NH36, NH38, NH70, NH71, NH72
      1. 1x Watch Case (Inclusive of sapphire)
      2. 1x NH Caseback (Depends on selection)

    • All photos of watches with modification parts are for illustration purposes only and are not included with modification parts purchased.

    • Recommended Mods With:

      1. Swiss Super-LumiNova® BGW9 Hands
      1. A Complete Guide On How To Mod Your SEIKO Watch Dial And Hands (Includes Photos & Video)
      2. Learn about fitting dials with four dial legs

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