An Optional velcro strap in black or gray was offered – these straps attached to the main male link of the bracelet. Luckily for us, the fabric strap through the IW3715-36 as well as the alternate rubber strap through the IW3548 suit the Aquatimer! If the Rolex Submariner ref. 116610LN https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/