Regarding dive watches, the common features are as follows:

1. A dive watch should be equipped with a unidirectional bezel (rotating counterclockwise).
2. For lume, dive watches commonly use Swiss Super-LumiNova® BGW9, C1, and C3.
3. Dive watches with a water resistance rating above 30 ATM are typically equipped with a helium escape valve, usually positioned at the 11 o’clock location. It can be either a hidden helium escape valve or an external helium escape valve.
4. Dive watches with a water resistance rating above 20 ATM typically use a screw-down crown.
5. For dive watches with a water resistance rating above 10 ATM, sapphire crystal is typically used for the watch crystal.

Tags： Diver watch Diving Watch 30ATM super time mechanical watches unidirectional bezel Swiss Super-LumiNova rotating counterclockwise