An Optional velcro strap in black or grey was supplied – these straps hooked up to the first male hyperlink with the bracelet. Fortunately, the fabric strap from your IW3715-36 and the alternate rubber strap through the IW3548 in good shape the Aquatimer! Christie’s This was largely a ref. 6538 https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/