Andy, REV-K sequence began in November '71. REV-M was never issued by DVLA, or what ever name they had then.
If you have seen a picture of such a car, it would be a false plated press car.
Cheers, Dave.
Ford did that a lot in the 70s, I think it would be just for photo purposes, possibly to make them appear newer, they wouldn't have been able to tax them.
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