Antenna, Mast VHF Type AN-74, for SCR-522 VHF Radio, B-17, B-25 Spitfire It is in exception condition

It is in exception condition

as used in B-17s (glass cracked)

When rotated to the desired letter by the Sender

Here is a Rate of Climb / Vertical Speed Indicator

this indicator appears to have a production year of 1937 (3768/37)

Antenna, Mast VHF Type AN-74, for SCR-522 VHF Radio, B-17, B-25 Spitfire It is in exception conditionThis is a fine example of a AN 74 VHF Mast Antenna as used for the SCR 522 airborne radio system during WWII. The SCR 522 VHF Radio Set was used in various early versions of US Army Air Corps Force aircraft models such as B 17 and B 25 bombers, as illustrated in the Airborne Radio Equipment Handbook dated 1943 (see illustrations). It is similar to the more common AN 104 Mast Antenna used in later aircraft versions. This radio set was intended for use