I have a 1967 coupe barracuda with a low serial number and shipped march 1966.

Krooser said

Despite mis information on the internet VIN numbers did not exist prior to 1969. Those earlier cars had simple serial numbers.

If you have a tag on your dash it's a VIN.... If not it's a serial number along with other ID info.

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my 1968 Barracuda has a dash tag, so it appears that VIN numbers appeared prior to 1969.

also I have seen comments that some internet VIN and plate decoders are not accurate. Does anyone have names , internet locations on the ones that are right?