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GS Watch Case - 36mm

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
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 have watch assembled, select (7) 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 36mm.
For 39mm, visit here
    1. Quality Swiss Production Quality, ISO 9001 Certified
    2. Case Material 316L Stainless Steel
    3. Case Diameter 36mm
    4. Case Thickness 12.5mm
    5. Bracelet Width 20mm taper to 18mm
    6. Lug to Lug 43mm
    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 9 reviews
A. (Whittier, US)
Using this mod part for: SNXA11
Salmon GS!!!

I absolutely love this case. The brushing is the best I’ve seen on seiko custom case. The bracelet on the other hand, you can tell attention to detail was missed here. All on the end links. I understand why though, to save cost and for the universality Between LA cases. But even though all this, the bracelet some how allows the case to showcase its dimensions. This has become my favorite custom Watch. @alonsinni

Clayton Crockett (New Orleans, US)
Awesome Case

Bought this case along with a lapis lazuli open heart dial and dauphine hands. Had to have this case soon as I saw them announced, and the style and build quality are wonderful. Lots of character compared to all of the explorer style 36mm cases out there. Highly recommend!

Eve Kinch (Regina, CA)
Using this mod part for: Custom build
Wonderful case!

The case is gorgeous and the 36mm size is super wearable. Very well done to the team at Lucius Atelier

Anonymous (Shah Alam, MY)
Could’ve been perfect

Finishing is nice but like the other 36mm case I feel like the proportions a bit out of whack with the thickness. It’s more than 13mm with the slightly domed crystal. I think the NH movements may be causing this difficult choice of not having the dial closer to the crystal as it feels a bit too deep currently but with tighter tolerances I think this could’ve help shelved some mm off the midcase area. Also the lug holes for the strap is so close to the edge making it accentuate the thickness of the case even more. But still I appreciate the effort in making this case!

Shaiyon Hariri (Walnut Creek, US)
Using this mod part for: Full LA watch

As other reviewers have mentioned, the finishing on this case is truly exquisite! The brushed bezel captures the light in an incredible way, lovely design. Slightly domed crystal is nice, and dimensions are perfect for my small wrist. The oyster bracelet doesn't sit flush with the lugs, and is clearly not made to fit this case perfectly, which annoyed me a bit at first, but it's a very small blemish in an overall exceptional package. Great buy, but skip the bracelet if what I mentioned would bother you (regardless bracelet feels great and is high quality)

David (Burnaby, CA)
Using this mod part for: Aftermarket
4.5/5 - Surprisingly nice finishing

This case is great, the finishing is surprisingly nice for the price. The brushed sides are super clean and smooth. Only thing I would like done better is the thickness... it is a little chunky.

Mark Gerrard (Bordon, GB)
Using this mod part for: GS 36mm case for NH38, Open Heart Snow Flake and Breguet Hands
Girlfriend's Watch

Long story, but she is estranged because of Covid and I promised her a custom watch like my own SKX013. Majority components purchased, she vetoed the dive watch concept and 39mm size, so I have 2 trick SKX mods. ;-)) Such a shame.
When L.A. announced the first 36mm GS design, I jumped at it.
I'm likely one of the first in Europe to handle one and I am absolutely Delighted.

J.T. (Glasgow, GB)
Using this mod part for: GS Watch Case - 36mm
Best aftermarket case out there

THe quality of this case is amazing. Not a single sharp edge in sight and the finish is amazing. A great backbone for any elegant build

Reviewer avatar
Garth Lobban (Diamond Bar, US)
Using this mod part for: Scratch build - all parts from LA
Grail Watch Build

I purchased the 36mm GS Watch Case to build up an homage to my grail watch, the Seiko SLGH005. I purchased the Shirakaba dial, lumed dauphine hand set. I chose the plain case back and O-style bracelet. I'm extremely pleased with the result. Thank you Adriel!!!