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SKX013 GS Diver Watch Case - 36mm (DLC BLACK EDITION) [NH34-Ready]

Your parts arrive as one finished watch — assembled and function-checked in my workshop. Adds 3–5 business days before shipping.
See It On A Watch

The Smallest GS-Style Diver. 36mm. Ready to Mod.

A compact 36mm diver drawn from the Grand Seiko diver lineage — clean case lines, drilled-through lugs, and a tight lug-to-lug that sits beautifully on smaller wrists.

One of the smallest GS-style dive cases out there. Add a bezel insert and it wears with serious presence. NH34 GMT-ready and built to fit our full SKX013 parts range.

Designed for all our 28.5mm dials and original NH movements (grey dial holding spacer).

This edition wears a DLC black coating — diamond-like carbon, roughly five times the surface hardness of 316L steel and far more scratch-resistant than standard PVD. A deep, durable black built for daily wear.

Small case, big wrist presence.
Case diameter 36mm, lug-to-lug 44mm, 20mm lugs — a genuinely compact footprint that still reads like a diver.

Drilled-through lugs.
Quick, tool-free strap swaps and a clean tool-diver look.

Built to dive.
200m / 20 ATM, tested. Screw-down crown. Universal springbars.

Fits the whole SKX013 ecosystem.
Bezel, insert, sapphire crystal, chapter ring, crown, dial, hands — all from our SKX013 range. 28.5mm dials; NH movements on the grey dial holding spacer.

The SKX013 case family — find your size

Case Diameter Lug-to-Lug Character
SKX013 38mm 38mm 45.5mm Our take on the discontinued SKX013 diver
SKX013 Submariner 36mm 36mm 45.5mm Vintage sub-style skin-diver
SKX013 GS Diver 36mm · YOU'RE VIEWING THIS 36mm 44mm GS-style diver, most compact

All three share the same DNA — 316L steel or DLC black, 200m / 20 ATM, drilled-through lugs, 28.5mm dials, NH movements, and a 20mm bracelet or strap. What differs is size and silhouette.

This exact case also comes in the natural 316L steel version .

Heads up — this is the case body. The rest is sold separately.

This case ships as a bare body (with click spring and gaskets). The bezel, insert, crystal, caseback, chapter ring, crown, dial, hands and movement are chosen separately — it's built to fit our full SKX013 parts range .

Chapter ring. This case needs an SKX013-spec chapter ring to seat the dial correctly — without it the dial sits too low and the hands won't clear. It takes both normal and ultra thin chapter rings; the choice depends on your dial, not the case. If your dial has applied (raised) indices, pick an ultra thin chapter ring for clearance; a flat-printed dial works with either. Browse SKX013 chapter rings .

Crown. Screw-down, SKX-style. Browse SKX013 crowns .

  • Dimensions

    1. Case Diameter 36mm
    2. Case Thickness 9mm (case body only, excluding caseback and crystal)
    3. Lug to Lug 44mm
    4. Lug Width 20mm

    Materials & Finish

    1. Quality Swiss Production Quality, ISO 9001 Certified
    2. Case Material 316L Stainless Steel with DLC Black Coating
    3. Lugs Drilled-through
    4. Crown Screw down, SKX-style
    5. Springbars Universal

    Compatibility

    1. Movements NH34, NH35, NH36, NH38, NH70, NH71, NH72
    2. Dials 28.5mm
    3. Chapter Rings SKX013-spec (required, sold separately)
    4. Hands NH movement compatible
    5. Crowns SKX-style
    6. Bracelets & Straps Lucius Atelier bracelets and 20mm straps

    Water Resistance

    1. Water Resistant 200m / 20 ATM (tested)
  • New to Seiko modding? You can build the whole watch right here — every part is an Add dropdown on this page. The case ships as a bare body (with the bezel click spring and the crystal & caseback gaskets); you choose the rest and spec it exactly how you like.

    Ten parts make a complete watch. You've got the case — here are the other nine, each a dropdown above, in the order you'd assemble them:

    1. Bezel — the rotating dive bezel. Browse SKX013 bezels .
    2. Bezel insert — the marked ring that sits inside the bezel. Browse inserts .
    3. Caseback — seals the case; solid, or sapphire to show off a decorated movement. Browse SKX013 parts .
    4. Chapter ring (required — seats the dial) — SKX013-spec; without it the dial sits too low and the hands won't clear. Browse chapter rings .
    5. Crown (required) — screw-down, SKX-style. Browse SKX013 crowns .
    6. Crystal — flat sapphire, pressed into the case. Browse SKX013 crystals .
    7. Dial (28.5mm) — match it to your movement: date, day+date, or no-date. Browse dials .
    8. Hands — paired to your dial; most modders match lume colour across hands and markers. Browse hands .
    9. Movement — NH35 (date), NH36 (day+date), NH38 (no date), or fit your own. Browse NH movements .

    Building an NH34 GMT? Add a GMT 24H hand (its own dropdown) and a GMT / NH34-specific dial — the 24-hour hand is the one optional extra on top of the ten.

    Optional extras (also dropdowns above): a 20mm bracelet or leather strap , and a Côtes de Genève decorated bridge + rotor — only visible through a sapphire caseback, and our bridges pair only with our rotors, so pick them together.

    Want it built for you?

    Under ADD, tick Assemble Watch (+SGD $139) and we'll do the full build in our Singapore workshop — crystal press, bezel and insert fit, movement seating, crown alignment, caseback press, and a final function check.

    Heads up: assembled watches need 2–5 business days of workshop time before they ship.

    Prefer to build it yourself? See the How To Mod tab for step-by-step tutorials.

    1. 1x Watch Case Body
    2. 1x Bezel Click Spring
    3. 1x Crystal Gasket
    4. 1x Caseback Gasket

    Springbars are included with our bracelets and straps.

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

    1. A Complete Guide On How To Mod Your SEIKO Watch Dial And Hands (Photos & Video)
    2. Fitting dials with four dial legs
    3. Seiko Modding: The Complete Build Guide (2026)

Questions, Answered

Everything worth knowing before you build.

Which caseback should I choose for the SKX013 GS Diver Watch Case 36mm DLC Black Edition?

Two SKX013-spec casebacks, both sold separately: a solid caseback for a clean closed back, or a sapphire (exhibition) caseback to reveal a decorated movement, bridge and rotor. Either keeps this DLC GS-style diver rated to 200m / 20 ATM. Choose solid for a stealth closed back; choose sapphire if you've added a decorated bridge and rotor worth seeing.

Are the case and bracelet edges sharp, or are they rounded off?

They are rounded off — but they are still crisp, and we would rather say that than have you open the box expecting something softer. "Sharp" is genuinely subjective: a Rolex is sharp too, and where one person reads that as crisp and well-defined, another finds it catches. The bracelet clasp is the sharpest part of the whole package — that is the part to know about before you commit.

If a previous mod was painful to wear, it is worth working out what actually caused it: a poorly finished lug edge digging in is a different problem from a clasp catching on the back of your wrist. Email hello@luciusatelier.com and say which it was, and you will get an honest answer on whether ours will be better or much the same.

Do you customize cases? Can I have a case machined or finished to my own spec?

Cases ship exactly as listed — no custom machining, no changes to size, lug width or lug shape, no alternative finishes of an existing case, and no engraving (a local engraver or jeweller can engrave a finished part after purchase). What you can customize is the build: choose the case, dial, hands, chapter ring, bezel insert, crystal and bracelet you want and LA will assemble the finished watch for you. Bespoke design work — one-off dials, mockups or renders, designing a build to a brief — is not offered. For fully custom work, see the list of watch modification specialists.

Can I use an aftermarket bracelet on this case?

No — only Lucius Atelier bracelets fit.

A bracelet isn't like a strap. Straps and NATOs hang off plain spring bars, so any 20mm strap works here. A bracelet with solid end-links is a different thing: the end-link is a shaped piece of steel machined to sit flush against one specific case profile. Ours are cut to the Lucius Atelier case shapes — that's what makes them look built-in rather than bolted on.

That precision cuts both ways. An aftermarket or OEM Seiko bracelet was shaped to its own maker's case, not to ours, so it won't sit flush here. The reverse is equally true: our bracelets don't fit generic 20mm lugs or OEM Seiko cases.

Every bracelet in our collection fits this case — including discontinued ones. A bracelet leaving the catalogue only means we stopped making it, never that it stopped fitting. Browse the bracelet collection: https://luciusatelier.com/collections/bracelets

If you'd rather not use a bracelet, any 20mm strap or NATO fits this case.

  • 5 stars: 2 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
J
Jackson G. (Austin, US)
Using this mod part for: SKX013
It's a great case

The GS diver case looked exactly like I hoped it would. It pairs well with the DLC bracelet and a number of other parts I got from this shop. Overall, I've worn my watch every day for about a year total now and it's holding up extremely well. I even took it snorkeling once to a depth of maybe 7-10 meters.

The DLC coating seems to be very durable. For all the dings I've given it, there are only a few tiny scratches that aren't really visible. It's not quite invincible, but all the other watches I've worn for this long look positively wartorn and this one still looks pristine. I'd say it's well worth the money.

N
Nate R. (Kent City, US)
Using this mod part for: SKX013
Solid case

Great case for a small wrist build. I have it pictured solo and with a SKX007 pattern to make a His/Hers build set for comparison. (007 on the left with green Nato band, the Lucius Atelier 013 case build on the right in all black).

It fits standard 013 compatibilities across the board with a couple exceptions. I assume it fits a standard 013 band, but can’t confirm. Brushing and polish are beautiful. Obviously it’s a modification from the SKX013 pattern to be a slightly smaller 36mm. Standalone, the final build feels somewhat topheavy compared to the 007 that has some 42mm of width to spread out the height, but on a smaller wrist, it works way better than the larger diameter overall. Very nice changes to fit a full feature mechanical dive watch on a lady wrist.

It’s been worn pretty hard for a couple months now with no scratches visible, so I’m not disappointed in the coating. No surprise, I have a DLC socket set with no scratches either.

I have only two negatives to point out.
1 - The inside edge of the lugs should have, in my opinion, been more chamfered, or at least the edge relieved. It’s a hard 90 degree edge there. With a passthrough or nato strap, it’s held away from the skin so no problem, but I can see this being uncomfortable on a leather band.
2 - The lugs are drilled a bit small. You’ll be able to use a springbar with a 0.8mm tip (common with the flanged variety), but not one of the diver springbars with the 1.1mm tip. I’d really have liked to use the more robust style springbars.

Final thought is that it’s a well made case and worth putting in a build you care about.