ARC-5 is a series of radio equipment that was used heavily in aircraft in WWII. They are also called "command sets". A large amount of this equipment was manufactured, and many were available on the surplus market after the war. As a teen, my first transmitter was an ARC-5 that covered 80 meters.

Here are two transmitters and a transmitter rack.

This transmitter covers 7 to 9 mhz.

This is an uncommon transmitter, an ARC-5 T-17, that covers 1.3 to 2.1 mhz.

This is a rack for a single transmitter.

It was modified by a ham, I assume that this is a simple AM grid modulator built into the rack.

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