An Optional velcro strap in black or grey was made available – these straps attached to the primary male backlink in the bracelet. The good news is, The material strap with the IW3715-36 along with the alternate rubber strap from the IW3548 suit the Aquatimer! fame, a collector and nostalgia https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/