1920s silver tonneau vintage Rolex watch

A silver tonneau vintage Rolex watch. The case measures 22 x 28 mm (excluding lugs). The case is marked silver and numbered to the back. The Swiss Made movement is signed Rolex, Timed to 6 positions, For All Climates, with 15 Rubies. The champagne dial has black Arabic numerals, subsidiary seconds, with fine blued steel hands. The dial is signed Rolex above the centre.