Help! Is A833 vin stamp legit?

I posted this on FBBO and FABO with limited action.

Could the VIN stamp on this A833 be legitimate? It has obviously been ground and re-stamped.

The smaller stamp looks correct and it’s date code suggests it for the correct model year of 71.

Has anyone seen confirmed numbers matching A833 ground and re-stamped from the factory?

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Author: PeniroN