A 19th century 18ct gold openface chronometer keywind pocket watch

A 19th century 18ct gold openface chronometer keywind pocket watch <BR> The white enamel dial with Roman numerals and gold spade hands, the damascend three quarter plate jewelled chronometer movement with fusee, spring detent, bimetallic compensated balance and rose-cut diamond end stone, in plain case, <I>hallmarked London 1853, case diameter 44mm, with fitted case stamped J.W. Benson</I><BR> Dial and movement signed George E Mylne no. 5577 <BR>