A rare 19th Century English keyless fusee chronometer in a silver wristwatch case. Gilt half plate keyless movement with fusee and chain. Harrison's maintaining power. Engraved cock with diamond endstone. Heavy compensation balance employing quarter timing nuts, freesprung helical blue steel hairspring. Earnshaw spring detent chronometer escapement, escape pivots with endstones. Signed white enamel dial with subsidiary seconds, Roman numerals, blue steel hands. Purpose made silver wristwatch case with solid lugs, gilt winding button, brown leather strap.