3 1/8" Radio Magnetic Compass Bearing Converter Indicator. Manufactured by Bendix. Model ID-251/ARN. P/N 7301-1C-3-B1. Very clean instrument. It shows very well and it would make an excellent show item for the home or office.
Originally installed on Military aircraft such as B-52 Stratofortress, F-8 Crusader and F-86 Sabre Jet and also found on civilian aircraft as well. Sold for display only.