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