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I think it is a 7CP4 left over from WWII use in drone bomb receivers. It has an odd bulge a the base of the bell before the neck. It mounts straight-in from behind the glass bezel.
The odd jacks were very clever by RCA. They were all different so only the proper jumper could be used from suitcase to suitcase connections.
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“Once you eliminate the impossible...whatever remains, no matter how improbable, must be the truth." Sherlock Holmes.
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