URBAN JURGENSEN SONNER JUMP SECOND
CHRONOMETER TRAVEL CLOCK
Urban Jurgensen Sonner, Riebenhaon, No. 1112.
Made circa 1880.
Fine, keyless, center-seconds, sterling silver deck Chronometer with Guillaume balance in original wooden box. Accompanied by
the original winding and front key.
Two part mahogany box that can be lifted in an upright position.
White enamel with Roman numerals, outer minute and seconds
rings with fifteen-minute/seconds Arabic markers. Blued steel hands.
83 mm. frosted gilt, straight line lever escapement, bimetallic
compensation balance, self compensating blued steel Breguet balance
spring, index regulator with micrometric adjustment screw.
Movement signed.