An Optional velcro strap in black or grey was offered – these straps attached to the main male connection of your bracelet. The good news is, The material strap from your IW3715-36 plus the alternate rubber strap from the IW3548 fit the Aquatimer! Past its excellent corrosion resistance, 904L stainless https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/