NMK312 - SKX/SRPD Domed Sapphire Crystal for Sloped Inserts (NH34 Compatible)



You can now build GMT mods without worry of hands stack clearance issues! This NMK312 SKX/SRPD Domed Sapphire Crystal for Sloped Inserts (NH34 Compatible) is designed to fit the new Seiko NH34 GMT Movement perfectly and will work on any SKX007/SRPD OEM and aftermarket cases, regardless of whether the case is compatible with NH34 movements. 

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.

Fits all our SKX007/SRPD Sloped Inserts.

Note: This crystal must be installed with the included NH34 Crystal Gasket, if you require more Crystal Gaskets as spare parts we do sell them separately here. Check out our NH34 Collection to view more products that are compatible for NH34 GMT Builds!



Cases: Compatible with all SKX007/009 and SRPD OEM and aftermarket cases. Movements: Compatible with NH34, 4R34 movements

Free International Delivery
  • Your order of S$50 (or equivalent in your local currency) or more gets free standard shipping, and orders above S$200 is eligible for free express shipping! Shipping costs will be automatically deducted at checkout.

Customer Reviews

Based on 625 reviews
ZP (Singapore, SG)

Quality you can trust


A great crystal as usual

N.L. (Hung Hom, HK)
Great quality

Not skilful nor confident enough to assemble on my own but the watch smith whom did the assembly praised the quality of parts notable the chapter ring which elevated the whole aesthetic experience.

Neil W. (Bedford, GB)
Flat Sapphire Crystal

Usually prefer to buy domed type.
Bought this flat sapphire crystal as my next mod is a Rolex homage and wanted to put a cyclops on the sapphire.

H. K. (Momchilgrad, BG)
It fits Seiko 5 GMT SSK003

The sapphire fits Seiko Ssk003 but it is just a bit of higher than the original Hardlex. The cyclope is better than the original and the magnification is just right and a little larger but not too much. The final look is very similar to the stock one.