This 31mm. OYSTER CHESTER (made by Rolex) is quite an uncommon variety. The original OYSTER case by ROLEX retains the original and uncommon OYSTER Patent screw-down winding crown. The steel case looks amazing for its circa 1947 production. The original dial and pencil hands also looks incredible. I love the patina this dial has adopted! The original TUDOR movement is manual winding and just cleaned-accurate. This is a mid-size watch-not too small and looks great on the wrist. These watches; such as the Essex, Bristol, Devon, London were all produced by Rolex in the 40’s and 50’s for the Commonwealth market. These OYSTER watches are very collectable and becoming quite difficult to find.