Hi guys.
I've just bought a 20mm alligator deployant strap for my new Seamaster 300m, as it came with rubber strap and I want to swap it.
Do I buy a 20mm or an 18mm clasp for this strap? And is anyone selling clasps please?
Cheers

 

could be 18mm or 20mm, why not just measure it?

 

It’s likely 18mm - but you need to measure at the end that attaches to the clasp. Some 20mm alligator straps taper to 16mm.

I don’t think Omega makes a 20mm clasp, either.

check the accessories sales section - they pop up on there from time to time. But don’t buy online unless you can spot a fake, or want to pay more than from the dealer. Best bet is through the sales corner here or an AD or boutique.