Mach Speed Indicator (Machmeter), Mk 3A, Ref 6A/3300, RAF Carvair The face supposedly screws off

The face supposedly screws off

Our example is yellow-tagged as serviceable

or banking left or right

according to the Maintenance Interchangeability Chart dated Feb 1945

Here is an Altimeter

Mach Speed Indicator (Machmeter), Mk 3A, Ref 6A/3300, RAF Carvair The face supposedly screws offThis is a fine example of a Cold War era Mach Speed Indicator Mk 3A Ref 6A 3300, as used in aircraft of the British Royal Air Force. The indicator displays aircraft mach speed from 0. 7 to 1. 3 mach. The serial number indicates a year of manufacture of 1958. The indicator is also marked with K. M. A. 0201K, likely a part number. The RAF Air Ministry arrow emblem is marked on the rear case. The adjustment screw at 6 o'clock position moves a white