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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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  • 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 / Products / 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 our SKX013 mod cases and the OEM Seiko SKX013 and SKX007.

    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.

    Six cases only.
    Our SKX013 Submariner 36mm, GS Diver 36mm and 38mm cases (standard & DLC), plus the OEM Seiko SKX013 and SKX007.

    Heads up — fit & install

    Fits our SKX013 Submariner 36mm, GS Diver 36mm and 38mm cases (standard & DLC Black Edition), plus the OEM Seiko SKX013 and SKX007 — links under Specs. Note the water-resistance trade-off: 100m on the slim, vs 200m on the standard solid.

    No gasket included. Unlike most watches, SKX gaskets sit on the outside of the case, so every case takes its own gasket size — one case's gasket will not fit another. That is why gaskets ship with the case, never with the caseback.

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

    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.

    • 5 stars: 2 (100%)
    • 4 stars: 0 (0%)
    • 3 stars: 0 (0%)
    • 2 stars: 0 (0%)
    • 1 star: 0 (0%)
    J
    Jeff

    Helps make the watch noticably thinner. Especially when on a nato strap.

    R
    Ruben U.V. (Tamuning, GU)
    Using this mod part for: Aftermarket case
    Quality built caseback

    Great finish and precisely made.

    S
    Sion

    Should this case back come with a rubber gasket or not ? Thanks

    Adriel from LuciusAtelier.com

    Hi Sion,

    Thanks for your question!

    The SKX Slim Solid Caseback – Silver Mirror Polished does not come with a rubber gasket. The gasket is only included when purchasing a case.

    If you’re sourcing the caseback separately, you’ll need to use your own compatible gasket that originates from your case.

    Let me know if you have any other questions!

    Best regards,
    Adriel
    Lucius Atelier | SEIKO Mod Parts

    J
    Jake

    Does it compatible with genuine skx013 case?

    Adriel from LuciusAtelier.com

    Hi,

    Thank you for expressing interest in our mod parts!

    Yes, the SKX Slim Solid Caseback - Silver Mirror Polished is compatible with a genuine SKX013 case.

    If you have any other questions, feel free to reach out—I’m happy to help!

    Best regards,
    Adriel
    Lucius Atelier | SEIKO Mod Parts

    B
    Ben

    Hello, I have an SRPJ87, case reference 4R36-13P0. It appears to have a 30mm thread, but do you know whether this caseback will be compatible?

    Adriel from LuciusAtelier.com

    Hi Gavin,

    Thank you for expressing interest in our mod parts!

    Unfortunately, the SRPJ87 (case reference 4R36-13P0) is incompatible with our casebacks. Our casebacks are designed for specific cases and may not match the threading or specifications of your model.

    If there's anything else I can assist with, feel free to reach out!

    Best regards,
    Adriel

    Y
    Yannick T.

    Hi, I considering a build using the NH34 GMT movement:
    - will it fit on your custom SKX013 cases despite being a thicker movement?
    - also, if i understood correctly, this caseback will add 0.75mm to the 9mm thickness of the case, reaching 9.75mm of thickness without considering the crystal, right?
    - how much thickness would be added to the 9.75mm thickness (case + caseback) if using a domed crystal like yours?

    Thanks for replying to all these questions!

    Adriel from LuciusAtelier.com

    Hello Yannick!

    Thanks for expressing interest in our mod parts!

    >> will it fit on your custom SKX013 cases despite being a thicker movement?
    NH34 is not a thicker movement. It has the same thickness as NH35/36/38/70/71/72 movements. Hence, it will fit out cases. However, it requires an additional 0.5mm height clearance as it has an additional hands, making it incompatible with most cases unless the cases are designed specifically to be compatible with NH34.

    >> also, if i understood correctly, this caseback will add 0.75mm to the 9mm thickness of the case, reaching 9.75mm of thickness without considering the crystal, right?
    That is incorrect. 0.75mm is merely the thickness of the caseback. The overall fitting is different as you will be screwing down the caseback.

    >> how much thickness would be added to the 9.75mm thickness (case + caseback) if using a domed crystal like yours?
    Usually, it will come out to be 13-14mm.

    Hope this make sense. Let me know if you have anymore questions.

    Cheers,
    Adriel

    B
    Bumpy J.

    Hi Guys,

    does this fit to the seiko snx79k? Is it also still waterproof then?

    Thank you
    Bumpy

    Adriel from LuciusAtelier.com

    Hello Bumpy!

    Thanks for expressing interest in our mod parts!

    >> does this fit to the seiko snx79k?
    No, it does not fit..

    Hope this helps. Let me know if you have anymore questions.

    Cheers,
    Adriel

    m
    marc

    Is this caseback also compatible with the Seiko SSK001 case which has the 4r34, AKA the NH34 movement?

    Adriel from LuciusAtelier.com

    Hello Marc!

    Thank you for expressing interest in our mod parts!

    >> Is this caseback also compatible with the Seiko SSK001 case which has the 4r34, AKA the NH34 movement?
    No, it is incompatible. The case are structurally different. SKX was original ISO Diver's 200m rated. The new series of SRPD, SSK, etc are not.

    Hope this helps. Let me know if you have any more questions.

    Cheers,
    Adriel

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