1920s round silver vintage Longines watch

An early silver round vintage Longines watch. The silver case measures 35 mm in diameter (excluding hinged lugs). The case is signed AB (Arthur Baume, director of Longines U.K.), hallmarked London 1922 and numbered. The 13.34 calibre manual wind movement, with a hinged protective dust cover, is signed B&Co. with 15 jewels and numbered. The white enamel dial has black open Arabic numerals, with subsidiary seconds dial and fine blued steel hands. The dial is signed Longines above the centre.