John Arnold, London No.339: A silver openface chronometer pocketwatch, in plain consular case, the white enamel dial with Roman numerals, large subsidiary seconds and gold spade hands, the signed and numbered gilt fusee movement with pierced cock and engraved foot, O-Z balance with three spoke steel ring with outer bi-metallic temperature compensation, diamond end-stone, gold helical spiral, Arnold's spring detent escapement set into the top plate, further inscribed Inv. et fecit, the case hallmarked London 1783, the casemakers stamp WW