Strictly speaking the Sinn U1 is a dive watch - it is waterproof to 1000m.
But those who believe it is a genuine diver's tool made for professionals whose lifes depended on the U1 are kidding themselves. Sure, the U Black would probably not work well as a professional diver's watch but that's not the point. The vast majority of dive professionals don't wear the U1 anyway, and will probably never come across one, let alone any of the other high-priced "diver's" watches we discuss here.
- SJX