1930s 9ct gold rectangular vintage Zenith watch

A 9ct gold rectangular vintage Zenith watch. The case measures 22 x 40 mm (including lugs). The case is signed Zenith, Swiss Made, marked 9K and numbered to the back. The 8 3/4 ligne movement is signed Zenith A, Swiss Made and numbered. The dial has black Arabic numerals with a subsidiary seconds dial and fine gold hands. The dial is signed Zenith, Favre-Leuba above the centre.