Authentic 5-CHM Soviet submarine clock by the Vostok factory (Chistopol, Russia). Such clocks were used by Soviet Navy ships and submarines for over 70 years. Work cycle: 7 days on complete mainspring winding up. Movement deviation should not exceed 1 second per 34°F (1°C) per day within temperature limits of 122°F (50°C) to -13°F (-25°C). Movement: 12 jewels. Diameter: 8.3" (21 cm). Depth: 3" (7.5 cm). Weight: 6.2 lbs (2.8 kg). Would make a terrific gift to anyone interested in Soviet military history. Ships within 10 business days. Note: body color may differ. Expedited shipping only.