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Here's a clue....Chassis number (if you can find one) will be a six digit number beginning with 120xxxx. Possible numbers 120699/1207xx and this would point to the direction of Howard Sams 724-3/3A. The "A" would be like a remote chassis. The radio chassis will be under another Howard Sams I would believe but 724 may be of some reference to that.
Other H.S. numbers may be 650-1, 598-2, 576-2....but these are getting quite a bit earlier but the chassis number would still be starting with 120xxx.
Even as a point of reference, an RCA CTC-15 is H.S. 673-2 so it shouldn't be earlier than that.
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