An Optional velcro strap in black or gray was supplied – these straps connected to the 1st male hyperlink on the bracelet. The good news is, The material strap in the IW3715-36 along with the alternate rubber strap with the IW3548 fit the Aquatimer! “Swiss Created” on the dial on https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/