Airspeed Indicator, Maximum Allowable, Type L-7A w/Mach Limiter, Kollsman 1214DX Smiths and radio equipment

and radio equipment

which indicates atmospheric pressure in inches of mercury

The back screws off

and the vertical bar deflects to give an appropriate "fly right" or "fly left" indication

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

Airspeed Indicator, Maximum Allowable, Type L-7A w/Mach Limiter, Kollsman 1214DX Smiths and radio equipmentThis 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