Here's a vintage 1976 Tudor/Rolex Snowflake Submariner.
Crisp and original, from the jet black dial to the still-sharp bevels.
Classic dimensions: 42mm across, excluding the signed, screw-down crown, by 48mm from lug to lug.
The caliber 2842 automatic movement keeps excellent time. This is model 9401/0. The 840--- serial puts it in the range of the Marine Nationale, issued by the French Navy.