Airspeed Indicator, Maximum Allowable, Type L-7A w/Mach Limiter, Kollsman 1214DX Smiths The loop was rotated by

The loop was rotated by a control panel (such as the MN-28

There is a "0" above an "A" at center position

indicating a manufacturing date of 1942

which indicates atmospheric pressure in inches of mercury

The toggles do flip and the keying switch still has its spring action

Airspeed Indicator, Maximum Allowable, Type L-7A w/Mach Limiter, Kollsman 1214DX Smiths The loop was rotated byThis is a Cold War era Airspeed Indicator, 0 650 Knots, Maximum Allowable, Type L 7A, made by Kollsman and used in aircraft of the US Air Force such as versions of the fighters F 86 Sabrejet, F 80 Shooting Star, F 84 Thunderjet, F 89 Scorpion, F 94 Starfire, trainer T 33, and versions of bombers B 47 and early B 52's (see illustration of B 52 panel). The main pointer rotates clockwise as the airspeed increases. The horizontally rotating drum above