SKX013 Diver 38 Origin — Ultra Thin Watch Case

PRE-ORDER · Ships 21 October 2026. 30% off while the first production run is open — the price returns to full at launch. The SKX013 Bezel. Reborn Ultra Thin. Ready to Build. The SKX013 Diver 38 Origin wears the bezel the SKX013 actually had. Not the Submariner's plain outer track, but the original's full minute ring - a dot at every minute, the whole way round, with numerals at 10, 20, 30, 40 and 50. It is the detail that told you, across a room, which watch you were looking at. We kept the drawing and changed the material. The original insert was anodised aluminium, which scratches and fades. Ours is black ceramic - the pattern fired in, not printed on - with a Swiss Super-LumiNova® BGW9 Grade A lume pip at 12. The crown moves to 3 o'clock rather than the original's 4, so the case takes standard 3 o'clock dial feet and the modding ecosystem you already own. Underneath, it is the SKX013 Diver 38 exactly - same case body, same 38mm diameter, same 10.86mm at its slimmest, same three casebacks and two crystals. The insert is the only thing that changed. If you want the modern Submariner-style track instead, that is the Black or Green. What we kept compatible is what modders actually want flexibility on: SKX-style crowns, SKX013-spec chapter rings, 28.5mm Seiko Mod dials, hands, and NH-series movements. Roughly 10% cheaper than building it part-by-part - and ready to assemble. Buying our SKX-style case body, matching bezel, ceramic insert, and sapphire crystal separately would cost about 10% more than this complete case. And you skip the hardest parts of the build: no crystal-pressing the sapphire, no fitting the rotating bezel, no sticking and aligning the ceramic insert. We ship it pre-fitted and pre-aligned. For a dive-style build with a rotating ceramic bezel, that's hours of finicky workshop time avoided. Wears 38, looks bigger. Case diameter 38mm. With crown guards the case width reaches 40mm. Lug-to-lug 46mm, lug width 20mm. A diver's silhouette on a small-wrist canvas. See how we measured it against a 42.5mm SKX007 . Genuinely thin. 10.86mm with the Ultra Thin solid caseback - one of the thinnest NH-compatible dive cases ever made. The NH movement alone is 7.59mm. That leaves just a few millimeters for the crystal, walls, and hand clearance. Tight engineering. The original track, dot for dot. A 60-minute black ceramic insert drawn from the SKX013's own bezel - minute dots the whole way round, batons on the fives, numerals at 10/20/30/40/50, and a BGW9 lume pip at 12. Ceramic where the original was aluminium. Pre-fitted and pre-aligned at our workshop. Three casebacks, two crystals. Pick the Ultra Thin solid caseback for the headline thinness. Pick the thicker solid caseback for full 200m dive-rating. Pick the sapphire caseback to display the movement - and consider adding a decorated rotor for a fully customised view through the back. Cyclops crystal pairs with NH35 only - the magnifier sits over the date window, so the dial must have one. Caseback Total Thickness Water Resistance Best for Ultra Thin Solid · HEADLINE BUILD 10.86mm 100m / 10 ATM Daily wear - the thinnest profile Thick Solid 11.36mm 200m / 20 ATM Modders who actually take it diving Sapphire 11.76mm 100m / 10 ATM Movement display - show off the rotor The Ultra Thin Solid caseback is the headline build - this is the case at its slimmest. The other two are for buyers prioritising dive-rating or movement display, and add slight thickness in exchange. Heads up — sold separately Crown. The crown shown in product photos is for visual reference only. Crowns must be selected above — choose from 5 SKX013-compatible options. Browse compatible crowns . Chapter ring. This case requires a SKX013-spec chapter ring to seat the dial correctly — without it, the dial sits too low and hands won't clear. The case fits both normal and ultra thin chapter rings; the choice depends on your dial, not the case. If your dial has applied (raised) indices, choose ultra thin for clearance. If flat-printed, either works. When in doubt, ultra thin is the safer default. Browse compatible chapter rings . For experienced modders only — TYPE M movements only This case fits TYPE M versions of NH35, NH36, NH38, NH70, NH71, NH72 only. TYPE L will NOT fit. Due to tight clearance between hands and sapphire, this case is recommended only for professional watchmakers and experienced modders. Specs Build Guide What's Included How To Mod Dimensions Case Diameter 38mm Case Width (with crown guards) 40mm Case Thickness 10.86mm (Ultra Thin Solid) / 11.36mm (Thick Solid, 200m) / 11.76mm (Sapphire) Lug to Lug 46mm Lug Width 20mm Materials & Finish Quality Swiss Production Quality, ISO 9001 Certified Case Material 316L Stainless Steel Case Finishing Brushed (lug tops), Mirror polished (lug sides) Bezel Unidirectional rotating, 120-click (pre-fitted at workshop, exclusive to this case) Bezel Insert Black ceramic, SKX013-pattern 60-minute track with minute dots throughout, with Swiss Super-LumiNova® BGW9 Grade A lume pip Crystal Flat Sapphire with clear AR coating (cyclops or no-cyclops, per selection; pre-installed, exclusive to this case) Crown Screw down, SKX-style compatible, 3 o'clock Compatibility Movements TYPE M: NH35, NH36, NH38, NH70, NH71, NH72 Dials 28.5mm Chapter Rings SKX013-spec (required, sold separately) Hands NH movement compatible Crowns 7mm SKX-style Bracelets Lucius Atelier bracelets only (designed exclusively for our cases) Water Resistance Ultra Thin Solid Caseback 100m / 10 ATM Thick Solid Caseback 200m / 20 ATM Sapphire Caseback 100m / 10 ATM New to Seiko modding? Here's everything you'll need for a complete, functioning watch — in the order you'd actually assemble it. What's already in this purchase: The case body, bezel + ceramic insert (pre-fitted), and your chosen caseback + crystal. That's the foundation. Everything below is what you'll add to make a functioning, wrist-ready watch. The 5 parts you'll need for a complete watch: Chapter ring — required first. The chapter ring seats the dial at the correct height; without it, the dial sits too low and the hands won't clear. (SKX013-spec — sold on a separate page. See the "sold separately" panel above for normal vs ultra thin guidance.) Browse compatible chapter rings Crown — five SKX-style options. Pick a style that matches the watch's character. (Required to add to cart. Selected from the dropdown above on this page.) Browse compatible crowns Dial (28.5mm) — the face of the watch. The biggest aesthetic choice you'll make. Match it to your chosen movement. Hands — paired with your dial. Most modders match lume colour across both hands and dial markers (BGW9 white-blue, C3 green, etc.). Movement — NH35 (date), NH36 (day+date), NH38 (no date), or source your own. The movement is the engine of the watch. Optional finishing touches: Bracelet or strap (20mm lug) — Lucius Atelier oyster, jubilee, president, GS, Seikonaut, Settimo, or more designs, plus custom shell cordovan / full-grain cowhide leather straps. Decorated rotor (only visible with sapphire caseback) — replace the stock NH movement rotor with our Côtes de Genève decorated rotor, viewable through the sapphire caseback. Recommended for experienced modders only — or tick Assemble Watch below and we'll handle it. Want it built for you? Tick the Assemble Watch (+SGD $89) option above on this page and we'll handle the full build in our Singapore workshop — case fitting, movement seating, crown alignment, caseback press, function check, and decorated rotor installation if you've added one. Heads up: assembled watches require 3–5 business days of workshop time before shipping. Once your parts arrive, see the How To Mod tab for assembly tutorials. 1x Watch Case Body (with pre-installed flat sapphire crystal - cyclops or no cyclops, per selection) 1x Bezel + Black Ceramic Insert, SKX013-pattern minute track (pre-fitted, pre-aligned, with BGW9 Grade A lume pip) 1x NH Caseback (Ultra Thin Solid / Thick Solid / Sapphire, per selection) All photos of watches with modification parts are for illustration purposes only and are not included with the case purchase. A Complete Guide On How To Mod Your SEIKO Watch Dial And Hands (Photos & Video) Fitting dials with four dial legs Seiko Modding: The Complete Build Guide (2026)