I have a vintage Rado that is all original. The problem is that the bracelet is just a bit too tight. It's okay on cooler days, but my wrist swells on warms days and makes all but impossible to wear. I've looked into clasp extenders and watched a few videos on how to attach them, so I'm confident I can do that.
The problem is what size should I buy. The area the clasp fits in is 15mm on the outside and 14mm on the inside. Do I buy a 15mm extender or the 14mm? I've included pics of the clasp in case they might help.
Thanks in advance,