Charles Frodsham, London, a water- and dustproof expedition silver deck watch

This is an extremely rare expedition deck watch from the famous London manufacturer Charles Frodsham.
This watch has a water- and dustproof silver case with a screw back, a winding crown under a screwed protective cap, secured by a chain.
The case is marked with case maker mark RN for Robert North. London date letter 1925. Off-white Willis dial. Diameter 59mm, 183 g
The English lever movement is of finest Quality (Frodsham ADFmsz) with screwed chatons and diamond endstone and gold screw compensation balance.
This remarkable watch from one of the most famous makers has just been serviced and is in perfect condition!