Squale 1521 automatic COSC This is my 1521 running around 1 second fast per day. This COSC watch has applied indices and a tropic rubber strap. It also comes with a leather strap that has never been used. The watch is in excellent condition with little signs has been ever worn. The watch comes with all the paperwork and tags including the COSC certification showing the testing process. This watch is 500m water resistant and is super comfortable to wear. The size states 42mm but it wears a lot smaller especially with the recessed crown. Any questions feel free to ask.