Chelsea Boston Shipstrike Mechanical Ships Clock Battle Indicators are not affected by

Indicators are not affected by local magnetic disturbances

5 inches diameter and ~2 inches tall

which was the WWI precursor (from 1914-1918) of today's US Air Force

The bombardier could control the top front and bottom front remote gun turrets using this pedestal sighting station

to keep the unit in a caged position for transport

Chelsea Boston Shipstrike Mechanical Ships Clock Battle Indicators are not affected byThis is an authentic Chelsea Boston Shipstrike Mechanical Ships Clock. The clock runs and chimes but has not been fully tested for accuracy. The winding key is not included. Measures 5 3 8 inches diameter and 3 3 8 inches deep.