For sale is a blue Rubber B strap from their SwimSkin line. It is Swiss Made and believe it is for 21/22mm. It was recently on a 22mm dive watch of mine.

These retail new for north of $300. It really is an incredible strap, just not what I currently need.

Looking for $125 OBO shipped CONUS. Venmo and PayPal accepted. Thanks and reach out with any questions.