1930s silver tank style vintage Longines watch

A silver tank style vintage Longines watch. The unusual case measures 22.5 x 31.5 mm (excluding lugs). The silver case is numbered 4572654, 9. The 9.47 calibre movement is signed Longines with 15 jewels and numbered 4572654. The dial has luminous Arabic numerals with a subsidiary seconds dial. The dial is signed Longines above the centre.