Description

An American 56 hour marine chronometer in a brass bound mahogany box.  Full plate damascened nickel keywind fusee movement, four turned pillars secured by polished steel screws.  Harrison’s maintaining power, polished steel barrel ratchet wheel on the barrel bridge.  Brass fusee and barrel. Two arm uncut balance with brass timing screws, two smaller micrometer adjustment timing nuts and two further even smaller timing nuts. Freesprung helical hairspring.  Earnshaw spring detent escapement, escape pivots with endstones. The movement secured to the gilt dial plate by three polished steel screws.  Engraved signed and numbered silvered brass dial with subsidiaries for seconds and power reserve indication, Arabic numerals, blue steel hands.  Turned brass bowl with knurled screw bezel, sprung rotating shutter to the winding aperture.  Brass gimbals and locking mechanism, brass ratchet key bearing the serial number.  Three tier mahogany box, drop brass handles, corners, and hinges.  Middle tier with two rectangular plaques, one engraved with the maker’s name, the other with the serial number.  Both these plates repeated inside the base below the bowl.  A black plate inside the middle tier bearing the serial number and “Ministry of Defence Hydrographic Dept. Chronometer Marine”.