An Optional velcro strap in black or grey was provided – these straps hooked up to the first male link from the bracelet. Fortunately, the fabric strap from your IW3715-36 and the alternate rubber strap from your IW3548 in good shape the Aquatimer! There is a wonderfully unique double index https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/