D - 38446 Wolfsburg
The owner of the '68 Bay has now sent off for the birth certificate, so we will look forward to finding out when it's actual birthday is.
Here is a photo of the M-plate (which has unfortunately been painted over!)
Here is the information as I entered it into the decoder:
And here are the results:
VW Beetle Specification Guide 1968-1980 by Richard Coping
I hope you find this information useful.......Happy Decoding!!!