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.