The 212975 represents the Ident number for this car, this same number will appear on the top right of the window sticker and car shipper. It also would have appeared on the build sheet and other production documents.
These images are for a 1966 Corvette but look in the top right corner of the window sticker and car shipper, the 801811 would be their Identification number.
1966 Impala SS
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