An Optional velcro strap in black or gray was offered – these straps attached to the main male hyperlink on the bracelet. Luckily for us, The material strap from the IW3715-36 and the alternate rubber strap from the IW3548 suit the Aquatimer! “Swiss Manufactured” about the dial of the watch https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/