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Gillette's Q and R Date Codes

Are these date codes correct?

Q1: 1971, January-March
R1: 1971, April-June
R2: 1971, July-September
R3: 1971, October-December
 
Krumholz's book says Q was mistakenly used "an estimated one or two months" in 1971. Presumably, both Q1 and R1 are still first quarter 1971. More like January and February = Q, February and March = R.

Also, a J1 can be either 1963 or 64 for a similar reason.
 
I've never seen an R-1, but that doesn't mean that there aren't some.

My best guess would be Q-1, R-2, R-3, R-4; all 1971 production.
 
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