A silver pair-cased pocket watch, signed Dierson and Co English 19th century 5.1 cm diameter, 7 cm high, 5.8 cm case diameter. A silver pair-cased pocket watch, signed Dierson and Co. English 19th century. Silver pair case watch, outer case and inner box plain, both bearing Birmingham hallmarks. for 1815-16, and the case-makers mark WR, possibly William Russell of Coventry. White. enamel dial, black Roman hour numerals, gold hands, more in the Continental style. Bullseye. glass, plain stirrup bow, flattened pendant. Fusee drive, verge escarpment, plain circular pillars. Symmetical pierced pattern on balance. cock, mask near foot, solid chased foot. Signed "Dierson & Co, London, 550" on the. backplate. Reference: There is no entry into Britten for Dierson & Co, suggesting they were retailers, rather than makers of watches. Provenance: Purchased from Max Cohen, Domoch Terrace, Highgate Hill, Brisbane, in about 1970. Dimensions: 5.1 cm diameter, 7 cm high, 5.8 cm case diameter