1930s 9ct gold rectangular vintage Dunhill ‘waterproof’ watch

A rare 9ct gold rectangular vintage Dunhill Waterproof watch. The case measures 22 x 38.5 mm (including lugs). The case is signed S.F.C. (Schwob Frères & Co.), hallmarked Glasgow 1937 and numbered. The case back is secured with four screws to the corners with a particular crown fitting. The manual wind movement, Ref. 364K, is signed Swiss Made, with 15 jewels, patented and numbered. The silvered dial has black alternate Arabic numerals, an inner minute track, with a subsidiary seconds dial and fine blued steel ‘re-lumed’ hands. The dial is Dunhill above the centre.