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Your radio is earlier than 1960 somewhere between 1956 and 1958. i did a bit of research into panasonic's corp history sites and "national" says their first circuit board radio was made in 1955 "3b-267" and also started work on it's first transistor radio in 1956 "6c-1". i think your radio is the 2nd or 3rd model they made as the chassis number on yours is a 270 the numbers or letters before the 270 would have told if this was a pocket, table etc radio. I can't even find a picture of a 6c-1 radio, about the only chance to find out more info is to contact the national panasonic museum in Japan. they themselves might not have a picture of this model but would be happy to have a copy of your pics for their records.
Congrats ona a extremely rare find!
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