An Optional velcro strap in black or grey was supplied – these straps attached to the 1st male link in the bracelet. Luckily for us, the fabric strap from the IW3715-36 as well as the alternate rubber strap from the IW3548 healthy the Aquatimer! If the Rolex Submariner ref. 116610LN https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/