WILLIAM LANGFORD, BROAD QUAY, BRISTOL. No. 1637 A MID 19th CENTURY ENGLISH TWO DAY MARINE CHRONOMETER having a three-tier mahogany box containing a gimballed brass frame with 8.5cm silvered engraved dial having a Roman and Arabic chapter ring surrounding two subsidiary dials for seconds and power reserve fronting a signed chain-driven fusee movement with Earnshaw-type spring detent, bimetallic compensated balance wheel, helical blued steel spring, and jewelled end stop 15.5cm wide, 15.5cm deep, 17cm high