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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 / SEIKO SKX013 Mod Parts / SKX Slim Solid Caseback - Silver Mirror Polished
    SKX Slim Solid Caseback - Silver Mirror Polished - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

    SKX Slim Solid Caseback - Silver Mirror Polished

    $22 SGD
    Worldwide
    Delivery         Express
    2–4 Days         Replies In
    1 Day         30-Day
    Returns

    The Slim Solid. 0.75mm. For SKX builds.

    The slim version of our solid caseback — thickness cut from 1.3mm to 0.75mm, which lowers the finished watch's profile on the wrist. Mirror-polished 316L stainless steel, made for SKX cases running Seiko NH movements.

    The trade-off is stated plainly: the slim back is water pressure tested to 100m, against 200m for the standard solid. For a dress or desk build chasing thinness, that's usually the right trade.

    Half the thickness.
    0.75mm of caseback — the low-profile pick.

    0.75mm thin.
    Down from the standard 1.3mm — the difference you feel under a cuff.

    Mirror-polished 316L.
    Solid stainless steel, polished to a mirror.

    100m rated.
    Water pressure tested to 100m — the slim trade-off, stated plainly.

    Fits SKX + NH.
    All SKX cases running Seiko NH movements — SKX007 and SKX013 families alike.

    Heads up — fit & install

    Fits all SKX cases running Seiko NH movements. Note the water-resistance trade-off: 100m on the slim, vs 200m on the standard solid.

    New to this? Seiko Modding: The Complete Build Guide walks through the whole build.

    • Specs

      1. Quality Swiss Production Quality, ISO 9001 Certified
      2. Material 316L Stainless Steel
      3. Surface Finish Polished
      4. Thickness 0.75mm
      5. Water Resistant 100m
      6. Fit SKX Cases using NH movement
      1. 1x Caseback

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

    • Fits all SKX cases running Seiko NH movements.

      Pairs with:

      1. Watch Cases
      2. Rotors & Bridges
      1. Seiko Modding: The Complete Build Guide (2026)

    Questions, Answered

    Everything worth knowing before you build.

    What's the difference between a solid and a sapphire caseback?

    A solid caseback is a plain steel cover — the cleanest look, and the standard version is water pressure tested to 200m when properly installed. A sapphire caseback sets a sapphire crystal into the steel ring, turning the back into a window on the movement. If you've fitted a decorated rotor or bridge, the sapphire back is what lets you see it.

    Will these casebacks fit my SKX007 or SKX013?

    Yes — they're designed for SKX cases, covering both the SKX007 family (7S26-0020) and the SKX013 family (7S26-0030), on builds running Seiko NH movements.

    Why choose the slim solid caseback?

    It cuts the caseback's thickness from 1.3mm to 0.75mm, which lowers the finished watch's profile on the wrist. The trade-off is water resistance: the slim version is pressure tested to 100m, against 200m for the standard solid caseback.

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