Could definitely be a memory thing, Mike.
After all it was only 51 years ago!
However, the delivery date in the purchase order and the transfer date on the Certificate of Origin (attached) both indicate February 12, 1969. I was only in Sindelfingen/Stuttgartt for one night and collected the car the following day and departed for Lugano via the old Gotthard Pass rail tunnel, the northern end being at Goschenen, Switzerland. Weil-Otterbach would appear to be to far to the west for this route however the best route then and now could be completely different.
I have a couple of other relevant documents in my files in Italy to check but I will not be able to access them for a couple of months yet. By the way, Fat Tuesday was February 18 that year!
Again, Thanks for all your efforts.