NMK304 - SKX/SRPD Flat Sapphire Crystal



Upgrading your crystal from stock Hardlex glass to a premium Sapphire Crystal is a great first mod for your SKX007 or Seiko 5 Sports SRPD. This NMK304 SKX Flat Sapphire Crystal is designed to be the perfect replacement if you like the original flat Hardlex but want to upgrade it to a much higher quality sapphire crystal.

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 Flat Inserts.

Compatible with SKX007, SKX009, SKX011, SKX171, SKX173, SKX175 and Seiko 5 Sports SRPD Range.

Also compatible with new SRPD Collection

5 Sports collection – SRPD55K3, SRPD57K1, SRPD59K1, SRPD55K1, SRPD55K3, SRPD57K1, SRPD59K1, SRPD61K1, SRPD63K1, SRPD65K1, and SRPD65K4

5 Suits collection – SRPD65K2, SRPD67K1, SRPD69K1, SRPD71K1, SRPD71K2, SRPD73K1, SRPD73K2, and SRPD75K1

5 Specialists collection – SRPD55K2, SRPD65K3, and SRPD76K1

5 Street collection – SRPD79K1, SRPD81K1, and SRPD83K1

5 Sense collection – SRPD77K and SRPD85K1

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 626 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.