Bill,
Walters last name is Grass. He lived in Muennerstadt in Germany, but the last time I saw him was Jan. 1982. He was planning his retirement then, infact I helped him renovate his retirement home. Considering the length of time since then I'm not sure he is still living. He was a WW2 veteran and would be over 90 years old now. He would not have a website even if living. There are others that do this work though, such as Henneburger.de, or Zimmerman.de, that do have a website. The total cost would be pretty high and there would likely be a long lead time.
Mike