[mockingbird812]

Looks like a double stamp for the partial VIN on a 325 HP/manual transmission 396 block put together on our 16th president's birthday. I expect that a closer shot would show a weak "5" for where the 6th character would be in the partial VIN stamping. Now, as for originality of the stamping, you would need to take a higher res close-up of the pad. Can't see broaching very well.