Radio Compass Bearing Indicator Type MN-40E Piasecki such as torpedo bomber TBM

such as torpedo bomber TBM Avenger

It is specifically labeled for use in aircraft of the US Air Force

Across the inside of the ring are two horizontal

Sperry part number 644836

Radio Compass Bearing Indicator Type MN-40E Piasecki such as torpedo bomber TBMHere is a good example of a Radio Compass Bearing Indicator, Type MN 40E, The face and its use is very similar in appearance to the I 82 A indicator of a number of radio compass systems used during and after WWII. The Bendix data label does not contain any recognizable US military markings and may have been for a civil commercial aircraft. The indicator was connected via flexible mechanical cable to a rotatable loop antenna mounted either on the top