An early 19th century 18ct gold openface chronometer pocket watch

An early 19th century 18ct gold openface chronometer pocket watch <BR> The white enamel dial with Roman numerals, subsidiary seconds and gold hands, the full plate chronometer movement with fusee and spring detent, three arm balance, flat hair spring and rose-cut diamond end stone with engraved balance cock, <I>hallmarked London,1808, case diameter 58mm</I><BR> The movement signed Grant, Fleet Street, London, 5413 <BR>