Course Selector, Kollsman ID-322 of AN/ARN-30 Radio Receiver UH-1, C-47, C-54 F4U Corsair Here is an instrument that

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

With over 400 pages

so the dates don't support the use of this specific instrument in an AC-130 but possibly earlier versions of the C-130

Mounted within the ball turret at the right foot of the ball turret gunner (see photo)

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)

Course Selector, Kollsman ID-322 of AN/ARN-30 Radio Receiver UH-1, C-47, C-54 F4U Corsair Here is an instrument thatThis 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