An Optional velcro strap in black or grey was made available – these straps connected to the very first male connection from the bracelet. The good thing is, The material strap from your IW3715-36 as well as the alternate rubber strap from your IW3548 in good shape the Aquatimer! 114060. https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/