Airspeed / Mach Speed Indicator, A-7E Corsair II C-54 This is a Beam Compass

This is a Beam Compass Indicator

B-25 Mitchell bombers

By rotating the scope on its base to align the path of these objects

Here is a fine specimen of a Swiss-made 24 hour

5 inches across and ~7 inches deep

Airspeed / Mach Speed Indicator, A-7E Corsair II C-54 This is a Beam CompassThis is a late 1960 70's era combination Airspeed and Mach Number indicator with Maximum Allowable Speed indicator, Type B020022115, made by Astek. This indicator was used in the E version of the US Air Force's A 7 Corsair II Attack aircraft. The contract number on the instrument has been positively identified in a US Dept of Defense document as corresponding to a US Navy order for A 7E aircraft with LTV in FY1967 69. See image of a A 7E instrument