An Optional velcro strap in black or grey was presented – these straps attached to the initial male hyperlink from the bracelet. Luckily for us, The material strap through the IW3715-36 plus the alternate rubber strap within the IW3548 in good shape the Aquatimer! Christie’s This was largely a ref. https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/