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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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    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 / Chapter Rings / skx013

    Chapter Rings

    The chapter ring — also called the rehaut — is the ring between the dial and the case wall. It carries the minute track your eye reads against, and it stays fully visible on the finished watch. Every ring here is machined in brass as a direct replacement for the plastic original in SKX007 and SKX013 builds, with brushed and polished finishes, marker or numeral tracks, and GMT 24H versions for the NH34 movement. Building on an Ultra Thin Edition case? Both ring heights fit — the FAQ below explains how to choose. Use the filters to jump to rings for your case.

    Shopping for a specific case?  All rings (57)SKX013 (47)SKX007 (10)GMT 24H (19)

    SKX013 Brushed Black Chapter Ring - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Black Chapter Ring - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Black Chapter Ring

    $25 SGD
    SKX013 Brushed Black Chapter Ring - GMT 24H Numerals — Ultra Thin
    SKX013 Brushed Black Chapter Ring - GMT 24H Numerals — Ultra Thin
    New
    SKX013 Brushed Black Chapter Ring - GMT 24H Numerals — Ultra Thin

    $25 SGD
    SKX013 Brushed Black Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Black Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Black Chapter Ring - GMT II 24H Numerals — Ultra Thin

    $25 SGD
    SKX013 Brushed Black Chapter Ring - White & Red Markers - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Black Chapter Ring - White & Red Markers - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Black Chapter Ring - White & Red Markers $25 SGD
    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
    SKX013 Brushed Black Chapter Ring - White Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Black Chapter Ring - White Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Black Chapter Ring - White Numerals — Ultra Thin

    $25 SGD
    SKX013 Brushed Black Chapter Ring [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Black Chapter Ring — Ultra Thin

    $25 SGD
    SKX013 Brushed Blue Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Blue Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Blue Chapter Ring - GMT 24H Numerals

    $25 SGD
    SKX013 Brushed Blue Chapter Ring - GMT 24H Numerals — Ultra Thin
    SKX013 Brushed Blue Chapter Ring - GMT 24H Numerals — Ultra Thin
    New
    SKX013 Brushed Blue Chapter Ring - GMT 24H Numerals — Ultra Thin

    $25 SGD
    SKX013 Brushed Blue Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Blue Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Blue Chapter Ring - GMT II 24H Numerals — Ultra Thin $25 SGD
    SKX013 Brushed Blue Chapter Ring [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Blue Chapter Ring — Ultra Thin

    $25 SGD
    SKX013 Brushed Gold Chapter Ring - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Gold Chapter Ring - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Gold Chapter Ring

    $25 SGD
    SKX013 Brushed Green Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Green Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Green Chapter Ring - GMT 24H Numerals

    $25 SGD
    SKX013 Brushed Green Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Green Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Green Chapter Ring - GMT II 24H Numerals — Ultra Thin $25 SGD
    SKX013 Brushed Ice Blue Chapter Ring - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Ice Blue Chapter Ring

    $25 SGD
    SKX013 Brushed Ice Blue Chapter Ring - Black Markers - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Ice Blue Chapter Ring - Black Markers - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Ice Blue Chapter Ring - Black Markers $25 SGD
    SKX013 Brushed Ice Blue Chapter Ring - Black Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Ice Blue Chapter Ring - Black Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Ice Blue Chapter Ring - Black Numerals

    $25 SGD
    SKX013 Brushed Ice Blue Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Ice Blue Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Ice Blue Chapter Ring - GMT 24H Numerals

    $25 SGD
    SKX013 Brushed Ice Blue Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Ice Blue Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Ice Blue Chapter Ring - GMT II 24H Numerals — Ultra Thin $25 SGD
    SKX013 Brushed Ice Blue Chapter Ring [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Ice Blue Chapter Ring — Ultra Thin

    $25 SGD
    SKX013 Brushed Orange Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Orange Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Orange Chapter Ring - GMT 24H Numerals

    $25 SGD
    SKX013 Brushed Orange Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Orange Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Orange Chapter Ring - GMT II 24H Numerals — Ultra Thin $25 SGD
    SKX013 Brushed Orange Chapter Ring [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Orange Chapter Ring — Ultra Thin

    $25 SGD
    SKX013 Brushed Purple Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Purple Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Purple Chapter Ring - GMT 24H Numerals $25 SGD
    SKX013 Brushed Purple Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Purple Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Purple Chapter Ring - GMT II 24H Numerals — Ultra Thin $25 SGD
    SKX013 Brushed Purple Chapter Ring [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Purple Chapter Ring — Ultra Thin

    $25 SGD
    SKX013 Brushed Red Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Red Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Red Chapter Ring - GMT 24H Numerals

    $25 SGD
    SKX013 Brushed Red Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Red Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Red Chapter Ring - GMT II 24H Numerals — Ultra Thin $25 SGD
    SKX013 Brushed Red Chapter Ring [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Red Chapter Ring — Ultra Thin $25 SGD
    SKX013 Brushed Silver Chapter Ring - Black & Red Markers - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Silver Chapter Ring - Black & Red Markers - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Silver Chapter Ring - Black & Red Markers

    $25 SGD
    SKX013 Brushed Silver Chapter Ring - Black Markers II [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Silver Chapter Ring - Black Markers II [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Silver Chapter Ring - Black Markers II — Ultra Thin $25 SGD
    SKX013 Brushed Silver Chapter Ring - Black Markers [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Silver Chapter Ring - Black Markers [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Silver Chapter Ring - Black Markers — Ultra Thin

    $25 SGD
    SKX013 Brushed Silver Chapter Ring - Black Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Silver Chapter Ring - Black Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Silver Chapter Ring - Black Numerals — Ultra Thin

    $25 SGD
    SKX013 Brushed Silver Chapter Ring - GMT 24H Numerals — Ultra Thin
    SKX013 Brushed Silver Chapter Ring - GMT 24H Numerals — Ultra Thin
    New
    SKX013 Brushed Silver Chapter Ring - GMT 24H Numerals — Ultra Thin

    $25 SGD
    SKX013 Brushed Silver Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Silver Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Silver Chapter Ring - GMT II 24H Numerals — Ultra Thin

    $25 SGD
    SKX013 Brushed Silver Chapter Ring [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Silver Chapter Ring — Ultra Thin

    $25 SGD
    SKX013 Brushed Sky Blue Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Sky Blue Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Sky Blue Chapter Ring - GMT II 24H Numerals — Ultra Thin

    $25 SGD
    SKX013 Brushed Yellow Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Yellow Chapter Ring - GMT 24H Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Yellow Chapter Ring - GMT 24H Numerals $25 SGD
    SKX013 Brushed Yellow Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Yellow Chapter Ring - GMT II 24H Numerals [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Yellow Chapter Ring - GMT II 24H Numerals — Ultra Thin $25 SGD
    SKX013 Brushed Yellow Chapter Ring [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Brushed Yellow Chapter Ring — Ultra Thin

    $25 SGD
    SKX013 Mirror Polished Black Chapter Ring - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Mirror Polished Black Chapter Ring - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Mirror Polished Black Chapter Ring

    $25 SGD
    SKX013 Mirror Polished Black Chapter Ring [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Mirror Polished Black Chapter Ring — Ultra Thin

    $25 SGD
    SKX013 Mirror Polished Gold Chapter Ring [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Mirror Polished Gold Chapter Ring — Ultra Thin

    $25 SGD
    SKX013 Mirror Polished Silver Chapter Ring - Black & Red Markers - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Mirror Polished Silver Chapter Ring - Black & Red Markers - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Mirror Polished Silver Chapter Ring - Black & Red Markers

    $25 SGD
    SKX013 Mirror Polished Silver Chapter Ring - Black Markers - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Mirror Polished Silver Chapter Ring - Black Markers - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Mirror Polished Silver Chapter Ring - Black Markers

    $25 SGD
    SKX013 Mirror Polished Silver Chapter Ring - Black Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Mirror Polished Silver Chapter Ring - Black Numerals - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Mirror Polished Silver Chapter Ring - Black Numerals

    $25 SGD
    SKX013 Mirror Polished Silver Chapter Ring [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Mirror Polished Silver Chapter Ring — Ultra Thin

    $25 SGD
    SKX013 Sandblasted Chapter Ring [ULTRA THIN EDITION] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Sandblasted Chapter Ring — Ultra Thin

    $25 SGD

    Chapter Ring Questions, Answered

    Fit, alignment, and which ring suits your dial — the things modders check before they buy.

    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.

    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.

    Will this chapter ring fit my SKX007?

    Yes — it's a direct replacement for the SKX007's original plastic chapter ring, sized as original. It also fits the SKX009, SKX011, SKX171, SKX173, SKX175, our 42mm Diver's watch case, and all 7S26-0020 watch cases.

    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.

    What is a GMT 24-hour chapter ring for?

    The ring carries a 24-hour numeral track in place of the standard markers. Paired with the Seiko NH34 GMT movement, the NH34's fourth hand reads against this track to show a second time zone. On a standard three-hand movement the track is purely decorative — the ring fits the same, but there's no 24-hour hand to read it, which is why we recommend it with the NH34.