English silver pocket chronometer, power reserve Circa 1859

Silver open faced freesprung “DUO IN UNO” balance spring
–
A gentleman’s very fine, heavy pocket chronometer with 30h power reserve indication and freesprung “DUO IN UNO”balance spring, circa 1859. Silver case, polished, tiered, reeded band, case maker’s punch mark “CBH” Dial is enamel, radial Roman hours, auxiliary seconds, signed, numbered, blue spade hands. Full plate movement, gilt, signed, chain/fusee, spring detent escapment, large gold screw compensation balance, blued “DUO IN UNO” balance spring, freesprung, chatoned diamond endstone on balance
–
Diameter: 59 mm
–
Weight: 177 g
–
Signed: Charles Frodsham London
–