NMK355 - SSK Flat Sapphire Crystal for Sloped Inserts
Love the Seiko GMT SSK but wished you could swap the bezel insert out with a sloped one? This NMK355 SSK Flat Sapphire Crystal is designed to fit all our SKX007 Sloped Bezel Inserts perfectly.
Modding your SSK with a sloped bezel insert is a breeze:
- The first step is, of course, getting this crystal
- Pair it with any of our SSK Bezels (please note that the stock SSK bezel is not compatible with SKX007 inserts).
- Finally, select one of our sloped SKX007 Bezel Inserts to complete your mod.
Our sapphire crystals have Anti-Reflective (AR) coating at the bottom side of the crystal. The AR coating comes in two colours - Blue and Clear AR.
Comes attached with 1pcs SSK Crystal Gasket. Need additional SSK crystal gaskets? Pick them up under Add-Ons above to ensure you have everything you need for a smooth upgrade!
Compatibility Guide
| Spec | Details |
|---|---|
| Crystal Diameter | 31.5mm |
| Case Compatibility | Seiko 5 SSK GMT Collection: SSK001, SSK003, SSK005 etc |
| Crystal Profile | Flat |
| Bezel Insert Profile | For Sloped Inserts |
| Movement Compatibility | NH34 (GMT), NH35/36 and NH70/71/72 |
| Gasket Compatibility | SSK Crystal Gasket |
Great slim crystal with excellent AR coating and clarity. I tried the domed version first, but the flat crystal works dramatically better on the SSK.
The most transformative upgrade. The domed profile adds depth and elegance, while the AR coating preserves clarity. It gives the watch a more considered, cohesive presence than the original Hardlex.
Excellent, inexpensive, upgrade for my SSK003. Really good quality crystal that is a perfect fit. Also, a very easy upgrade as the crystal can be replaced without removing the bezel. I recommend a good pair of tweezers to remove the old crystal gasket, and a sturdy crystal press. No more unsightly scratched cyclops. I honestly think the Hardlex was scratched within weeks of owning the watch.
I’ve always admired the timeless design of the Rolex GMT Pepsi. To give my underutilized Seiko SSK series a fresh look, I decided to mod it. After researching online, I discovered Namoki, a local SoCal supplier with the perfect parts. The shipping was incredibly quick, and the packaging was top-notch. Namoki's quality and service have me considering future modding projects for my other watches.
Great slim crystal with excellent AR coating and clarity. I tried the domed version first, but the flat crystal works dramatically better on the SSK.
Pleased with the products, impressed with the service
Good AR, great way to strengthen an SSK and ditch the cyclops.
The SSK and SRDP have only a few things lacking. Spending $45 to upgrade to a sapphire crystal is a no brainer. This slim domed crystal fits perfectly on the slim bezel I bought from Namoki. Great clarity with minimal reflection.
Clear and perfect
Fast shipping well packaged
Perfect fit with Seiko 5 Sports SSK. Very impressive. Thank you Namoki teams.
Perfect fit!
This crystal made me like my SSK again. It’s a huge improvement over the stock glass.
This crystal fit my SSK perfectly. Installed nice and easy and looks so much better.
It’s it’s perfectly
Fits prefectly !
Perfect fit and quality.
Excellent, it couldn’t be better.