Victor Kullberg (1824-1890) was a Swedish chronometer maker who worked in England, whose instruments excelled at the Greenwich Trials. The U.S. Navy Bureau of Ships transferred this example to the Smithsonian in 1953. It is a 56 hour instrument with a later pattern Earnshaw spring detent escapement, and indications for hours, minutes, seconds, up and down. The serial number indicates that it was made in 1891Ref: Tony Mercer, Chronometer Makers of the World (Colchester, 1991), pp. 183-184.
