Airspeed / Mach Speed Indicator, 80-850 Knots, 0.4-2.5 Mach, F-8 Crusader H-21 nine clear plastic altitude-azimuth templates

nine clear plastic altitude-azimuth templates for use at different latitudes up to 85° north and south

The specifics of the modifications is not known

Not too bad for a 70+ yr old artifact

The MN-20E was retrofitted on various P-40 Warhawk and P-51 Mustang models in the China/Burma/India theater

Being partially a gyro instrument it has

Airspeed / Mach Speed Indicator, 80-850 Knots, 0.4-2.5 Mach, F-8 Crusader H-21 nine clear plastic altitude-azimuth templatesThis is an Air Speed Mach Speed Indicator as used in the Viet Nam War era US Navy Fighter Vought F 8 Crusader. Made by Bendix, part number 1454 62A B62 1. See photo of indicator on the F 8 panel from its flight manual dated Sept 1978. The indicator displayed airspeed from 80 850 knots, and mach speed from 0. 4 to 2. 5 mach. Airspeed is displayed from 80 200 knots on the scale from 1 4 o'clock, and then from 80+ knots on the center inner scale window