Who's the A body fender tag deciphering guru? Question about a car in the"For Sale" area...

So it appears to me that it is on the fender tag (G31). Would that mean it was an A/C car ? Why else would this be on the fender tag ? Or my eyes are lying to me . After all my eye's aren't what they once were
That is C31 G33 is the G code.

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