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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 34 reviews
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.

Tyler (Phoenix, US)
Using this mod part for: NA, building one up
Fast and good

Arrived very quickly. Have order other parts that took a lot longer to arrive (USA) but this took like 3 business days. The case looks very nice.

Harley (Charleston, US)
Great finishing

The finishing on the case is really good, really fun to mod with!!

Mike H. (Missouri City, US)
Using this mod part for: GS aftermarket Case
Fast Shipping

Great watch case for something similar to the Grand Seiko case.
This case was used to replace another case that I had.

MARK J.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.

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.

Roni B. (Mount Royal, CA)
Rough finish

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

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

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