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GS Watch Case - 39mm

Caseback (Fits Movement Types)

Important Note: In order for bracelet to be universally compatible with our oyster bracelet, final GS case will NOT have drilled through lug holes. The blue protector film on the crown is removable. Photos will be updated after the new year. Thank you.

ONLY 4 main components are needed to complete a watch.
Watch Case
Rotor (optional)
Movement Holder (optional)
Tweezer (optional)


  • For the watch case, select your (1) Case, then (2) Bracelet (optional), and lastly (3) Caseback (To fit different types of movements).
  • For a complete watch, select your (4) Dial, (5) Hands and (6) Movement.
  • To decorate movement, select your (7) Rotor (optional).
  • To have watch assembled, select (8) Assemble Watch. Please note that assembling the entire timepiece requires 2 to 5 business days prior to shipping.

Engineered by us and made exclusively for us with quality assurance by ISO 9001 Certified manufacturers.


The First and Exceedingly High Quality GS Case designed after Limited Edition Grand Seiko SLGH003!

Comes complete with double domed clear AR sapphire, caseback (solid or sapphire), screw down crown with optional solid brushed oyster bracelet.

Designed to fit all of our dials (28.5mm) and original NH movements (grey dial holding spacer). Additionally, case has ability to fit ETA2824/SW200/SW260 and ETA2893/SW330 movements. Special spacer and caseback provided.

The bracelet clasp is also designed to have micro-adjustment without the need for removing or adding links.

Watch case has a water resistant of 200m.

This watch case is 39mm.
For 36mm, visit here
    1. Quality Swiss Production Quality, ISO 9001 Certified
    2. Case Material 316L Stainless Steel
    3. Case Diameter 39mm
    4. Case Thickness 12.8mm
    5. Bracelet Width 20mm taper to 18mm
    6. Lug to Lug 46.5mm
    7. Lug Width 20mm
    8. Crown Screw down
    9. Crystal Double Domed Sapphire with Clear Anti-Reflective Coating
    10. Crystal Size 29.5mm x 1.5mm x 3mm
    11. Water Resistant 200m / 20atm
    12. Fit Movements NH35, NH36, NH38, ETA2824, ETA2893, SW200, SW260, SW330
    1. 1x Watch Case (Inclusive of sapphire and crown)
    2. 1x Oyster Bracelet (Depends on selection)
    3. 1x NH Sapphire Caseback (Depends on selection)
    4. 1x ETA2824/SW200/SW260 Movement Spacer (Depends on selection)
    5. 1x ETA2893/SW330 Movement Spacer (Depends on selection)
    6. 1x ETA2824/SW200/SW260 Sapphire Caseback (Depends on selection)
    7. 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 modification parts purchased.

  • Recommended Mods With:

    1. Swiss Super-LumiNova® BGW9 Hands
    1. A Complete Guide On How To Mod Your SEIKO Watch Dial And Hands (Includes Photos & Video)
    2. Learn about fitting dials with four dial legs

Customer Reviews

Based on 30 reviews
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.

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

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

Roni Berbari (Mount Royal, CA)
Rough finish

The finishing of the metal was not great it is roughly finished I had to refinished my self!

Gerald Oil (Edmonton, CA)
Really good

Case is built well, sapphire looks good, tolerances are quite good. The domed sapphire on this case is beautiful

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

Quality and sobriety

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

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

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.

Using this mod part for: Aftermarket
GS 39mm - beautiful case

Great case, came in clean and well packaged. Beautiful case, I have a white birch dial and alligator band going with it. I hope to post some pics when I'm done.

Nelson Milano (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.

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 😍