An Optional velcro strap in black or grey was supplied – these straps attached to the initial male hyperlink from the bracelet. Luckily, The material strap through the IW3715-36 along with the alternate rubber strap through the IW3548 fit the Aquatimer! The Royal Oak celebrates its fiftieth anniversary this year https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/