NMK356 SSK Slim Sapphire Crystal for Flat Inserts

GMT movements are great, they allow you to track multiple time zones with ease. However, this added functionality often comes at a cost—thickness. The additional gears and components required for the GMT function naturally increase the height of the movement, making most GMT-equipped watches bulkier than their standard counterparts.

That's why we've engineered the NMK356 SSK Slim Sapphire Crystal specifically to reduce the overall thickness of your Seiko SSK. It is designed to be installed with our SSK Slim Bezels and a flat bezel insert to give you the slimmest SSK mod possible. 

Paired with a flat bezel insert, you can achieve an SSK build with a thickness of just 12.3mm—making it 10% slimmer than the stock SSK that's 13.6mm thick!

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!

Note: This NMK356 Slim Crystal is meant to pair our with any of our SSK Slim Bezel and Flat SKX007/SRPD Bezel Inserts only.