An Optional velcro strap in black or gray was provided – these straps attached to the 1st male hyperlink of your bracelet. Thankfully, the fabric strap from your IW3715-36 along with 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/