That's probably a series 1 - the manual shows no ZIP code (pre-1964....) and the knobs match the design patent (2509415) image, so it's definitely early....IIRC, early serial numbers are inside, stamped in silver or white ink.
__________________
Brian
USN RET (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
Last edited by Findm-Keepm; 12-22-2016 at 09:47 AM.
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