Course Selector, Kollsman ID-322 of AN/ARN-30 Radio Receiver UH-1, C-47, C-54 F4U Corsair such as the F7F Tigercat

such as the F7F Tigercat fighter and versions of the PBY Catalina and PBM-5 Mariner patrol bombers (see illustration from the F7F flight manual dated 1947)

the indicator would indicate to the pilot-in-training simulated directional signals received from ground transmitters by the loop antenna

The limit markings (green/red) along the circumference of the glass match the limits per the flight manual (see photo of the markings from the manual)

Here is an instrument that you've probably not seen before

WHEEL ASSEMBLY-26

Course Selector, Kollsman ID-322 of AN/ARN-30 Radio Receiver UH-1, C-47, C-54 F4U Corsair such as the F7F TigercatThis is a Course Selector, made by Kollsman, part number 1559 010130, ID 322 as used in the AN ARN 30 Radio Receiver System (see photos of system and its description in gallery) during the 1950s 60's. According to Designation Systems. net, AN ARN 30 was used in versions of the following aircraft: UH 1, H 19, H 25, H 34, CH 47, CH 53, OV 1, B 57, C 47, C 54, C 117, S 2, T 33. Measures 3. 25in diameter and ~5in deep. It is in nice condition given its