Have had this simnce I was a young buck and wondering if I can get some help identifying it at long last...unmarked, weighs about 19.7 grams, no hallmarks, rear retainer pin mounted at top, no screwback with it...magnetic core, nice tight solder job...all I know...cant remember where it came from (in the mid 1960's)...
Thanks in advance..
Thanks in advance..
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