An Optional velcro strap in black or gray was supplied – these straps connected to the very first male connection of the bracelet. Luckily for us, The material strap from the IW3715-36 and the alternate rubber strap from your IW3548 in good shape the Aquatimer! Rolex helps make above 1M https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/