H.H. Heinrich Eight-day Marine Chronometer

H. H. Heinrich Eight-day Marine Chronometer, no. 644, New York, c. 1880, silvered, 4 1/2-in. roman numeral dial with subsidiary seconds and up/down sector, marked H.H. Heinrich , New York , No. 644 , chain fusee movement with spotted plates, spring detent escapement, maintaining power, split bimetallic balance, helical balance spring, in a fully gimbaled brass bowl with screw bezel, three-tier, brass-bound, rosewood box with brass carrying handles and maker's plaque marked as the dial, ht. 9, wd. 8 1/2, dp. 8 3/4 in.