G. M. Lane & Co, London "Aero" Vintage Watch 1932-9

A rare mid-size patented tonneau-shaped manually wound Pilots wristwatch.
The watch runs as it should, and is a very good timekeeper.
There is a fair ammount of plating loss, especially to the back, which has "MM" and an aeroplane embpssed into the back - I have been unable to find which company MM might be!
28mmx38mm case.
George Murray Lane, trading as G. M. Lane & Co were based close to St Paul’s Cathedral at 24-26 Ludgate Hill, London, EC1. Established on 9th May 1927, the company were predominantly jewellers and silversmiths but also supplied watches to British Airways, Imperial Airways and flying clubs around the world.
G.M Lane & Co. were listed in the 1937 Aeroplane Directory of the Aviation and Allied Industries. In 1938, the company were advertising their watches with the tag line “The Watch that Pilots Trust”. The marketing advantages for a brand associating with such a glamorous and relatively new form of transport are clear. It is interesting that the advertisements made specific note that waterproof versions of G. M. Lane’s watches were available for an additional fee. 
The movement and case of this watch were made in Switzerland for G.M. Lane by the General Watch Co. . The dial is signed for G.M. Lane & Co., London and is branded ‘Aero’ and marked waterproof.