An Optional velcro strap in black or grey was available – these straps connected to the first male website link in the bracelet. The good news is, The material strap within the IW3715-36 plus the alternate rubber strap within the IW3548 suit the Aquatimer! Rolex can make around 1M watches https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/