View Omega Seamaster Clasp Upgrade US. This is the one from the seamaster. Omega seamaster pro 300 clasp upgrade (adjustable).
After much googling, i found a lot of chatter (by some members of the board here, no less) about clasp springs.
Omega adjustable 6 position clasp, details and specs. Discount code for smc purchases is everyday2019 blue nato can be found on their website here. With 300 meters of water resistance, an exhibition case back, and a matte black or blue. You'll receive email and feed alerts when new items arrive.