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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

    Seikonaut
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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

    Seikonaut
    • Home / Casebacks

    Casebacks

    The caseback is the cover that seals the back of the case. This collection has two paths: a solid 316L stainless steel back for a clean, classic look, or a sapphire exhibition back that turns the rear of your watch into a window on the movement — rotor, bridge and all. There's also a slim solid version that cuts the back's thickness from 1.3mm to 0.75mm for a lower-profile build. All three are made for SKX cases running Seiko NH movements.

    SKX Sapphire Caseback - Silver - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
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    SKX Sapphire Caseback - Silver

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

    $22 SGD
    SKX Solid Caseback - Silver Mirror Polished - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX Solid Caseback - Silver Mirror Polished

    $22 SGD

    Seiko Caseback Questions, Answered

    Solid or sapphire, standard or slim — what to know before you close the case.

    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.