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I dont think it was a Federal requirement until 1968.From the original stapings I have seen, it would not be typical for the entire serial number to be stamped in the format you have shown.
67 Shelby's had the VIN stamped into the trans that way. I do not know if it is typical for a regular Mustang to have a VIN stamped . I had always heard prior to 1968 that it was only done on the high performance cars that had a high risk of being stolen. I am not sure how valid that is given the picture.