Chronometer, Russian Marine Gimballed, Brass with Rosewood Case
Hamilton designed and made by Moscow Watch factory in 1997. All documents and calibration records included. Very rare model.
A chronometer is an instrument for measuring time, especially one designed to keep accurate time in spite of motion or variations in temperature, humidity, and air pressure. Chronometers were first developed for marine navigation, being used in conjunction with astronomical observation to determine longitude.