Definitely not before 1980 because I bought a new Pontiac that year from Haggerty Pontiac in Villa Park, Ill and they had the same Dealer Code as from the '60s as I recall it.
Tom, when was the latest your uncle had his code?
If the codes changed, I thought it might have been in the late '80s or even the '90s.
Can't say for sure, but I thought it was a retired GM guy that mentioned it in a thread here some years ago.
Don't know why else I'm remembering that possibility.
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