An Optional velcro strap in black or grey was made available – these straps hooked up to the first male link of the bracelet. Luckily for us, the fabric strap from the IW3715-36 plus the alternate rubber strap through the IW3548 in shape the Aquatimer! When the Rolex Submariner ref. https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/