LIONEL J-38 TELEGRAPH KEY
J-38 type of CW/Morse keys were used by all branches of the US
military. Were manufactured as part of the the war effort by a few
specialized US companies. They manufactured them almost identical and
sometimes it is hard to recognize the factory that produced that
Some of the companies were:
American Radio Hardware (ARH), Lionel Corporation, Telegraph Apparatus Corporation (TAC) and there were two more of unknown manufacture: One made entirely of brass including its frame and, the last one, made entirely of white metal including the frame.
They look all the same and parts are interchangeable between different manufacturers.
Very small differences that could give away the possible manufacturer are known.
The most easily type of J-38 CW keys to identify is the one made by the Lionel Corporation.