1920s early 9 ct gold round vintage Longines watch

An early 9 carat gold round vintage Longines watch. The case measures 31 mm in diameter, with hinged lugs. The case is signed A.B. (Arthur Baume, director of Longines U.K.), numbered 4169336 and hallmarked London 1924. The fine quality movement is signed Longines with 16 jewels and has a protective dust cover. The white enamel dial has black Arabic numerals with a red twelve and subsidiary seconds dial. The dial is signed Longines above the centre.