An Optional velcro strap in black or gray was offered – these straps connected to the first male backlink from the bracelet. Thankfully, The material strap with the IW3715-36 as well as alternate rubber strap within the IW3548 suit the Aquatimer! “Swiss Built” around the dial from the watch - https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/