THOMAS EARNSHAW, LONDON, CIRCA 1800

THOMAS EARNSHAW, LONDON, CIRCA 1800
AN OPENFACE SPRING DETENT POCKET CHRONOMETER, MOVEMENT NO. 535
Gilt full plate movement with chain fusee, maintaining power and spring detent escapement, plates engraved 'Thomas Earnshaw Inv.t et Fecit, No. 535, London No. 2881', later silver engine turned case with London hallmark for 1843, mark of casemaker Samuel Saltmarsh, enamel dial with subsidiary seconds, signed 'THOMAS EARNSHAW / INV.T ET FECIT / No. 535', gold heart and pointer hands and blued steel seconds hand
Silver, brass and enamel
55 mm. diameter