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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 / Products / SKX013 Brushed Black Chapter Ring - White Markers — Ultra Thin
    SKX013 Brushed Black Chapter Ring - White Markers [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Black Chapter Ring - White Markers [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Black Chapter Ring - White Markers [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Black Chapter Ring - White Markers [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

    SKX013 Brushed Black Chapter Ring - White Markers — Ultra Thin

    $25 SGD
    See It On A Watch
    Worldwide
    Delivery         Express
    2–4 Days         Replies In
    1 Day         30-Day
    Returns

    Ultra Thin Edition — our thinnest chapter ring.

    Thinner than before. The OEM ring is 2mm wide; our standard SKX013 ring is 1mm; the Ultra Thin Edition takes it to 0.75mm — a 62.5% reduction. That extra clearance suits dials with indices sitting at 27mm or less, for a more discreet ring and a cleaner dial. A brushed black replacement for the SKX013 plastic chapter ring.

    Made exclusively for us with quality assurance by ISO 9001 Certified manufacturers.

      1. Quality Swiss Production Quality, ISO 9001 Certified
      2. Material Brass
      3. Surface Finish Brushed
      4. Colour Black
      5. Dimension 0.75mm (Ultra Thin Edition — 62.5% width reduction of OEM)
      6. Outer Diameter 28.5mm
      7. Inner Diameter 27mm
      8. Pin Stabiliser Without — uniform design holds alignment; adhesive may be used to secure
      9. Fit SKX013, SKX015, SKX017, all 7S26-0030 cases, and our cases
      1. 1x Chapter Ring

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

    • Recommended mods with:

      1. Ultra Thin Edition Cases
      2. Seiko Mod Dials
      3. Seiko Mod Hands

    Questions, Answered

    Everything worth knowing before you build.

    What is a chapter ring on a watch?

    The chapter ring is the ring that sits between the dial edge and the case, carrying the minute and hour markings around the dial. On SEIKO's SKX models it's a plastic part from the factory; ours is machined brass with printed markings for a crisper, more finished look. Swapping it is one of the simplest cosmetic upgrades in a Seiko mod — a small part with a big effect on how sharp the dial side reads.

    What is an SKX013 chapter ring and why does it matter?

    A specific size and spec used by Seiko in the SKX013 (discontinued 2019). The LA smaller-case lineup all uses this same spec, which means dozens of chapter ring designs work across every smaller case in the catalogue.

    Will this chapter ring fit my SKX013?

    Yes — it's made for the SKX013 and also fits the SKX015, SKX017, all 7S26-0030 watch cases, and our own cases. Dimensions are customised over the OEM ring for greater clearance and a clean pairing with our dials.

    How does the chapter ring stay aligned without the OEM's pin?

    The SKX013's original plastic chapter ring has a protruding pin at its base to lock the hour and minute markers in line with the dial. Our ring does away with the pin — its uniform structure means alignment isn't affected in normal fitting. If you want it locked absolutely solid, a small amount of adhesive can be used to secure the ring's position.

    Should I choose the normal or the ultra thin chapter ring?

    The choice depends on your dial, not the case — both sizes fit every Ultra Thin Edition case. If your dial has applied (raised) indices, the ultra thin chapter ring is the better choice because its slimmer profile gives the indices clearance instead of resting on top of them. If your dial is flat-printed (no applied markers), either size works. When in doubt, the ultra thin chapter ring is the safer default because it works with both dial types.

    Do I need to remove the sapphire crystal to install the chapter ring?

    No — and that's the whole point of us pre-installing the sapphire for you. The chapter ring sits on top of the dial inside the case, not under the crystal, so the crystal stays where it is throughout the build. (If you ever do need to remove the sapphire — for example, to replace it — that's a workshop job we handle for you, not an at-home step.)

    • 5 stars: 11 (92%)
    • 4 stars: 0 (0%)
    • 3 stars: 1 (8%)
    • 2 stars: 0 (0%)
    • 1 star: 0 (0%)
    This product has no reviews of its own. The merchant grouped it with related products, so the reviews shown are from across that group.
    S
    SGR (Ichihara, JP)
    SRP491 dial

    This chapter ring is a perfect fit.

    SGR review photo SGR review photo
    A
    A L. (Knoxville, US)
    Using this mod part for: SKX013
    Fits Perfectly...Great Service

    If you're adding an aftermarket dial to your SKX013 and the hour indices are farther out on the dial, your original chapter ring won't fit. This chapter ring is thinner and a perfect fit with upgraded dials. It's very well made.

    A note on Adriel: I had a question about something on the website and got a response very quickly. When my orders come they always have a personal note in the box and it doesn't seem pre-written. It's like buying parts from a friend. Great Job, Adriel!

    A L. review photo A L. review photo A L. review photo A L. review photo
    F
    Faissal J. (Marseille, FR)
    Using this mod part for: Skx013
    Top

    Super qualité et livraison rapide

    A
    A G.Y. (Newham, GB)
    Excellent chapter ring

    Excellent quality and outstanding fit on my Seiko OEM dial!

    B
    Balázs B. (Budapest, HU)
    Using this mod part for: SKX013
    SeikonL SKX013 chapter ring

    I ordered only a very small part. Adriel was very kind and professional, I got continous info about the status if the delivery.
    The handwritten note came with the item was very kind an personal.

    T
    Trevor S. (Plymouth, US)
    Using this mod part for: SKX013
    Exactly What I Needed

    This is a perfect fit if you need a chapter ring with a larger inner diameter than the original skx013 chapter ring.

    M
    Marcus J. (Malmo, SE)
    Very nice

    Very fast shipping
    Nicely and well packaged
    The chapter ring is exactly what I wanted

    C
    Colin (Dayton, US)
    Using this mod part for: Aftermarket SKX013 case
    Perfect fit

    I like some others who reviewed this item, hastily bought the incorrect chapter ring for an SKX013 build that did not fit the dial I wanted to use. This chapter ring fits perfectly now!

    H
    Hiro (Shizuoka, JP)
    Perfect!

    It has high dimensional accuracy and fits perfectly on the SEIKO Mini Turtle dial.

    D
    DAVID F. (Passaic, US)
    SKX013 Thin Chapter Ring

    I was pretty hasty when planning my 013 build and was not aware that standard chapter rings may not fit all dials in this sized case. Luckily Lucius Atelier had a thin chapter ring that fit perfectly. I paid a little extra for expedited shipping and it was well worth it. Great fit and finish and shipping was timely. The hand written note from Adriel was icing on the cake - little things like that show that owners are truly engaged in their business and care about customer satisfaction. Would definitely order from here again.

    Z
    Zach B. (Arlington, US)
    Using this mod part for: Skx013
    Not thin enough

    Even though this is advertised as allowing more clearance for a variety of dials, it doesn’t have enough clearance for my seiko Mohawk. Great quality and I’ll buy from Adriel again but can only give 3 stars this time.

    T
    Thien N. (Gotokuji, JP)
    Using this mod part for: SKX013
    Great quality ring!

    The fit is perfect, it is about half the thickness of an SKX013 normal chapter ring.

    V
    Vitali

    Re: SKX013 Brushed Black Chapter Ring - White Markers [ULTRA THIN EDITION]
    https://luciusatelier.com/products/skx013-brushed-black-chapter-ring-white-markers-ultra-thin-edition
    what is height of this ring in mm?
    Thank you in advance

    Adriel from LuciusAtelier.com

    Hi Vitali,

    Thank you for expressing interest in our mod parts!

    All SKX013 chapter rings have a standardised height of 1.4mm.

    Let me know if you have any other questions—I’d be happy to help!

    Best regards,
    Adriel
    Lucius Atelier | SEIKO Mod Parts

    F
    Francesco

    Does this fit into an SNXS case?

    Adriel from LuciusAtelier.com

    Hi Francesco,

    Thank you for expressing interest in our mod parts!

    This Chapter Ring is not compatible with the SNXS case. The dimensions and fitting method differ between the two models.

    If you have any other questions or need help finding compatible parts, feel free to reach out!

    Best regards,
    Adriel
    Lucius Atelier | SEIKO Mod Parts

    L
    Laszlo

    Are you planning to release a silver colored ultra thin variant with marker in the near future?

    Adriel from LuciusAtelier.com

    Hello László!

    Thanks for expressing interest in our mod parts!

    >> Are you planning to release a silver colored ultra thin variant with marker in the near future?
    Yes, in the near future.

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

    Cheers,
    Adriel

    Z
    Zachary

    Is like to buy an ultra thin 36mm case. If I purchase the chapter ring could I please have the crystal installed? £50 seems high for a crystal press. Thanks

    Adriel from LuciusAtelier.com

    Hello Zack!

    Thanks for expressing interest in our mod parts!

    >> If I purchase the chapter ring could I please have the crystal installed? £50 seems high for a crystal press.
    Crystal for the case comes installed.
    Assemble watch option is for full watch assembly, not just crystal installation.

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

    Cheers,
    Adriel

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