An Optional velcro strap in black or gray was available – these straps connected to the very first male link in the bracelet. Thankfully, The material strap through the IW3715-36 as well as alternate rubber strap from the IW3548 in shape the Aquatimer! The Royal Oak celebrates its fiftieth anniversary https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/