Maybe you should scan or transcribe that letter for us, since all other sources say that Walther once again began manufacture of the PP/PPK series pistols in Germany in the 1980s. I'd be interested to see your documentation.
For those who would like to read the entire letter it is to be found in the "Original and real Swat Magazine" in the Year 1982, I cannot remember what months issue. When I get the time I will post the exact month of the issue in question.
The truth would probably never have been known if it had not been for the fact that the French lost the right to the Mauser banner label and it was given to to the Americans after they started to produce the PP series of pistols in America. Perhaps the biggest mistake Walther ever made. The reputation damage that Walther sustained from the shoddy workmanship of the American made guns lost it a lot of buisness and money right up to this very day.