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63 had conelrad markings
64 the am/fm were red and green
65 and up they were black
The tuners were upgraded in 64 and again for 65 thru 67.
There was a paper tag with stuck on them with a sequence number. Somewhere around there is a table of these numbers which has corresponding significance..
Don't take this as gospel, I'm often wrong
I believe there is a Diode or at least a round nickle size object on the back towards the top and in the middle which has a stenciled date on it. Scott