|A very rare late 19th Century Swiss chronometer deck watch with spherical hairspring and reverse keyless fusee in a silver open face case. Keyless gilt bar movement with reverse fusee and barrel under separate bridges. Detent for Harrison's maintaining power under a separate cock appended to the
fusee bridge. Plain cock, compensation balance employing quarter timing nuts, stepped arms to accommodate the rare freesprung spherical blue steel hairspring. Pivoted detent chronometer escapement with gold escape wheel, escape and lever pivots with endstones in gold settings. Unusual polished steel spring with notched screw to adjust the tension applied to the pivoted detent. Fine clip on signed white enamel dial with subsidiary seconds, Roman numerals,
blue steel hands. Substantial plain silver open face case with gold hinges, hand set and winding button. Signed silver cuvette, number corresponding to that on the movement. Unusual flat glass with concave inner surface providing a slight degree of magnification.