abrod520
·In principle that sounds good, but I have many skin divers with screw down crowns, and some watches with bidirectional bezels that are clearly professional divers by any measure (military issue dive watch, 1000m depth rating, etc.). I think the boundaries are pretty blurry.
I'm not saying it's a hard and fast rule - just what seems to be most common. The skin divers tended to be cheaper watches bought on vacation (most with economy movements) and a bit smaller.
As for Supercompressor watches, those didn't have screw-down crowns but they did have other water-resistant features - a skin diver generally just relies on its seals.