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Discontinued

GS Watch Case - 39mm v2 [NH34-Ready]

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

The GS Dress Case. Faceted Lines, 39mm. Built to Take Five Movements.

A clean dress case in the Grand Seiko idiom — sharp facets, a slim polished bezel, dial-forward proportions — sized at a confident 39mm.

Built around a selectable caseback, so one case fits five movement families: Seiko NH, Swiss ETA2824 and ETA2893, and Sellita SW200, SW260 and SW330. Pick the caseback for your movement and the matching spacer and caseback ship with it.

The sapphire crystal is already pressed in and a screw-down crown is fitted, so the case arrives ready for dial, hands and movement. Designed to fit our 28.5mm dials, an SKX013 chapter ring, and original NH movements on the grey dial holding spacer. NH34 GMT-ready.

Five movements, one case.
Seiko NH, Swiss ETA2824 and ETA2893, Sellita SW200, SW260 and SW330 — chosen by the caseback you pick. The movement spacer and matching caseback are supplied.

Sapphire, already in.
A double-domed sapphire with anti-reflective coating, pressed and sealed in our workshop — and a signed screw-down crown fitted. You skip the riskiest press of the build.

Dress proportions, 39mm.
Case 39mm, lug-to-lug 46mm, 20mm lugs. A slim bezel and a sapphire that lifts the dial — it wears every millimetre of its size.

Fits the 28.5mm dial ecosystem.
28.5mm dials, an SKX013 chapter ring, NH-compatible hands. Pairs with our 20mm bracelets and straps.

The GS case family — find your size

Case Diameter Lug-to-Lug Character
GS Watch Case 39mm v2 · YOU'RE VIEWING THIS 39mm 46mm Faceted dress case, largest
GS Watch Case 36mm v2 36mm 43mm Faceted dress case, classic mid-size
GS Diver 36mm 36mm 43mm Dive-styled GS, 200m bezel look

All three are the same GS platform — 316L steel, 200m / 20 ATM, a double-domed sapphire pre-installed, 28.5mm dials, an SKX013 chapter ring, and a 20mm bracelet or strap. The 39 and the Diver are NH34 GMT-ready; the 36mm dress runs NH35/36/38 plus Swiss ETA and Sellita.

Heads up — what's in the box, and what's sold separately.

This case ships with the sapphire crystal pre-installed and a screw-down crown fitted. The dial, hands, chapter ring and movement are chosen separately — build it to fit our full dial range .

Chapter ring. This case needs an SKX013 chapter ring to seat the dial correctly — it is mandatory and never included. 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 .

  • Dimensions

    1. Case Diameter 39mm
    2. Case Thickness 12.8mm (Solid Caseback), 13.3mm (Sapphire Caseback)
    3. Lug to Lug 46mm
    4. Lug Width 20mm

    Materials & Finish

    1. Quality Swiss Production Quality, ISO 9001 Certified
    2. Case Material 316L Stainless Steel
    3. Crystal Double Domed Sapphire with Clear Anti-Reflective Coating
    4. Crystal Size 29.5mm x 1.5mm x 3mm
    5. Crown Screw down

    Compatibility

    1. Movements NH34, NH35, NH36, NH38, NH72, ETA2824, ETA2893, SW200, SW260, SW330
    2. Dials 28.5mm
    3. Chapter Rings SKX013-spec (required, sold separately)
    4. Hands NH movement compatible
    5. Bracelets & Straps Lucius Atelier bracelets and 20mm straps

    Water Resistance

    1. Water Resistant 200m / 20 ATM (tested)
  • The case ships with the sapphire crystal pressed in and a screw-down crown fitted. You choose the rest below — every part is an Add dropdown on this page — and the caseback you select sets which movement family the case fits.

    Four more parts make a complete watch, each a dropdown above, in the order you'd assemble them:

    1. Chapter ring (required — seats the dial) — SKX013-spec; without it the dial sits too low and the hands won't clear. Browse chapter rings .
    2. Dial (28.5mm) — match it to your movement: date, day+date, or no-date. Browse dials .
    3. Hands — paired to your dial; most modders match lume colour across hands and markers. Browse hands .
    4. Movement — a Seiko NH, or a Swiss ETA2824/2893 or Sellita SW200/260/330 (pick the matching caseback above). Browse movements .

    Building an NH34 GMT? Add a GMT 24H hand and a GMT / NH34-specific dial — the 24-hour hand is the one optional extra.

    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 — movement seating, caseback fit, crown alignment, dial and hands, 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 (sapphire crystal and screw-down crown installed)
    2. 1x NH Caseback (depends on selection)
    3. 1x ETA2824/SW200/SW260 Movement Spacer (depends on selection)
    4. 1x ETA2893/SW330 Movement Spacer (depends on selection)
    5. 1x ETA2824/SW200/SW260 Sapphire Caseback (depends on selection)
    6. 1x ETA2893/SW330 Sapphire Caseback (depends on selection)

    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 movements fit the GS Watch Case 39mm v2?

Five movement families in one case, set by the caseback you pick: Seiko NH (NH34/35/36/38/72), Swiss ETA2824 and ETA2893, and Sellita SW200, SW260 and SW330. The matching movement spacer and caseback are supplied with your selection. It's NH34 GMT-ready, so a true GMT build is on the table. Dial, hands and an SKX013 chapter ring are chosen separately.

Which caseback should I choose for the GS Watch Case 39mm v2?

The caseback does two jobs: it matches your movement family (Seiko NH, Swiss ETA2824/2893, or Sellita SW200/260/330) and sets the back style. Choose solid for the slimmest profile at 12.8mm, or the sapphire (exhibition) caseback at 13.3mm to show the movement. The matching movement spacer and caseback ship with your pick.

Customers praised this 39mm watch case for its exceptional quality and finishing. Reviews highlight "great attention to detail" and "easily on par with something 2-3x the price." The case features excellent polishing/brushing effects and curved back design. However, one customer noted chapter ring alignment issues.

  • Easily on par with something 2-3x the price you'd buy from a manufacturer.
  • Parts are always finished to such a high standard, they really are the best in the game.
  • Great case, good attention to detail with the finishing.
  • 5 stars: 37 (79%)
  • 4 stars: 7 (15%)
  • 3 stars: 3 (6%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
Some of the reviews shown are from related products the merchant grouped with this one.
J
John (San Antonio, US)
Using this mod part for: 39mm GS case
39mm GS GMT

Do business with Lucius Atelier for parts to build a GMT was an enjoyable experience! Adriel was great to communicate and answering every question I had, I could have asked for a better experience. Once received the parts in record time I began the build. Love how the Dial, Case and hands made a fantastic looking GMT watch. I will certainly do future business with Lucius Atelier!!

S
Sean (Edmonton, CA)
39mm GS style

This is the second case I've purchased from Adriel and I was happy to find that the quality is just as good as the first case I bought. I'll for sure order more cases from Adriel in the future.

C
Christopher (Atlanta, US)
Very high quality

Super impressed with the whole experience. I had this watch assembled and it was easily on par with something 2-3x the price you’d buy from a manufacturer.

W
Wessam E. (Riyadh, SA)
Using this mod part for: Aftermarket case
Amazing case, failed chapter ring execution

The case design, material and finishing are simply amazing. Rivals quality from big names. Where it fails is the execution of the mandatory chapter ring, there is no way to fix the chapter ring to the case as you have to install it from the back of the case. So it was sliding around freely, even after fixing the dial the chapter ring moved and the markers became un-aligned.

P
Pedro R. (Mt. Pleasant, US)
Amazing case and products

Where do I begin? This was my first full build, that was not a kit, and I was so glad I purchased from LA. The quality is remarkable. I will be buying again for any of my modding needs.

B
Ben W. (Crawley, GB)
Using this mod part for: Aftermarket case from Lucius Atelier
Gorgeous

Never had an order from Lucius Atelier that has been anything other than fantastic.
I was asked to build a watch with a particularly personal attachment for the commissioner, and L.A. was the obvious recommendation - the parts are always finished to such a high standard, they really are the best in the game for parts for building on the NHxx base.
Lovely brushing and polishing on the case with great crisp lines, nicely proportioned, and effortless to build.
The little handwritten note from Adriel was also a lovely touch. Couldn't be happier, and the recipient of the watch is absolutely delighted.

T
Tommy T. (Lincoln, US)
Using this mod part for: Full custom mod build
Beautiful Watch!

I ordered this GS case built with all of the components that I selected. It was shipped and arrived precisely on time and it is better than I even anticipated. I am amazed at the quality of the watch, the fast shipping and the great communication every step of the process by the vendor.

F
Frederic M. (Paris, FR)
Using this mod part for: Custom build with SKX013 compatibility
Absolutely marvelous !

This case is superb. Nice polish/brushed effect. Vert well made.

E
Erik S. (Meteren, NL)
Using this mod part for: Aftermarket case
Absolutely stunning GS 39mm

For my grail watch I ordered the 39mm GS case and bracelet, Brequet hands and Blue GS 9SA5 rotor.

Case and bracelet came in a nice box. The bracelet is a tight fit. All components are quallity made, the pictures don't do it justice. With this quallity it"s an easy build.

m
mARK G. (Bordon, GB)
Using this mod part for: SKX013 39mm is the key
M.C. Esher inspired

Simple build. Usual feedback about lug holes, but fits my brief for a non diver in my collection that now extends to 5 watches with help from Adriel. NH72 in this case is a winner.

D
Dusan N. (Prague, CZ)
Using this mod part for: Building from scratch
Great products

I bought a dial and the case and they both look awesome.

S
S.S. (Conil de la Frontera, ES)
GS Exp NE15

Quality and sobriety

S
Stefano S. (Conil de la Frontera, ES)
Simple and flawless

50 / 5.000
Resultados de traducción
A product with a high quality / price ratio

C
C. (Jackson, US)
Using this mod part for: Aftermarket GS case
Beautiful Case

Another nicely finished well priced case. I made a lume beast watch for fishing trips, rubber strap because it will get wet, and it should be easy to read night fishing.
Fast delivery. I agree with everyone else's comments on the lug positions, they are in a weird spot but looks good enough with the rubber strap.

N
Nelson M. (Tarentum, US)
Using this mod part for: Aftermarket case with NH35 movement
Seiko Nova

The finishing on this case is really great! The photos don't do it justice. Like others said, the lug bar holes are a bit low and close to the edge. They could be a bit higher.

The case was used along with the starry dial and GS style hands.

K
Kai (Bandar Seri Begawan, BN)
Using this mod part for: GS 39mm case
GS 39mm case tiffany mod

With this GS 39mm case pair with turquoise dial & GS dauphine hands. It turns into a beautiful timepiece. In love with this mod 😍

M
Marcin

Hi,
I have Seikonaut Bracelet 20/16mm.
Will it fit to GS Watch Case - 39mm v2?

Adriel from LuciusAtelier.com

Hi Marcin!

Thanks for expressing interest in our mod parts!

Yes — the Seikonaut Bracelet 20/16mm will fit perfectly with the GS Watch Case - 39mm v2 [NH34-Ready].

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

Best regards,
Adriel
Lucius Atelier | SEIKO Mod Parts

G
Giles K.

Hi! I’m wondering if a 31mm dial would fit in the case if I were to not use a chapter ring as I found a beautiful dial, but it only comes in 31mm. Would it fit? Or would its hr indexes conflict with the rehaut of the inner side? Thanks in advance!

Adriel from LuciusAtelier.com

Hello HJ!

Thanks for expressing interest in our mod parts!

A 31mm dial will not fit. The limit is 29mm.

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

Cheers,
Adriel