English chronometer with 56 hour power reserve Circa 1860

Deck chronometer in mahogany box
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An English deck chronometer with 56 hour power reserve made by Victor Kullberg in London, circa 1860. The brass movement with chain and fusee, a spring chronometer escapement, chronometer balance with two weights and six screws, free swinging, cylindrical balance spring and chatoned diamond endstone on the balance. In a mahogany box with screwed-on shield and handles, with lid and sight glass and brass gimbal housing. Silvered dial with inlaid Roman hour numerals, an outer minute track, power reserve indicator at 12 o’clock, small seconds at 6 and gold spade hands. Dial signed, case and movement with matching numbers.
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Dimensions: 195 x 190 x 190 mm
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Signed: Victor Kullberg, 3 Denmark Grove, Islington, London
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Victor Kullberg was born in 1824 in Visby on the Swedish island of Gotland. From 1840, he was apprenticed to a chronometer maker and, after completing his training, worked for Louis Urban Jürgensen in Copenhagen, Denmark.
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In 1851, Kullberg went to London for the World Exhibition. He then stayed in England and worked as a marine and pocket chronometer maker, for which he developed a number of innovations. For his high quality movements and the performance of his new auxiliary compensation, Victor repeatedly received ratings in chronometer tests worldwide and was awarded numerous gold and silver medals.
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Because of his worldwide trade and international reputation, he was selected as chronometer maker for the Swedish and Norwegian navies in 1874, and the head of the Royal Observatory in Greenwich said of one of Kullberg’s clocks that took part in the Greenwich tests in 1882 that this was “the best chronometer ever tested there”. 
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Kullberg remained unmarried, but had two sons. After his death on July 7th, 1890, they inherited the business together with Kullberg’s nephew Peter John Wennerstrom. After Kullberg’s sons died, Wennerstrom and his son bought the remaining shares in the company, which was later continued by Sanfrid Lindquist until the premises were destroyed in World War II.