An Optional velcro strap in black or grey was available – these straps connected to the primary male hyperlink with the bracelet. Thankfully, The material strap with the IW3715-36 plus the alternate rubber strap from your IW3548 in shape the Aquatimer! Christie’s This was mostly a ref. 6538 — it https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/