Rolex Open Face Gold Plated Pocket Watch C1920/30s

Hand wound top wind and time change in a gold plated Dennison star case. 
Unsigned white enamelled dial with black Roman hours and blued steel hands with subsidiary seconds dial at 6o/c. 
Swiss made Rolex signed 17 jewel jewelled lever movement with split bi-metallic balance and overcoil hairspring.
Dennison case numbered 850874

Case diameter - 48mm.

The Rolex watch company started in 1905 as Wilsdorf and Davis in London. The company registered the name Rolex in 1908 and moved to Switzerland after WWI.