I realize this an ancient posting. That being said, I have been searching for the source of "Vandrey, Hamburg" for years. I purchased a 1959 production Walther PP .22LR in 2004. It is stamped on the frame just aft of the trigger, "Vandrey" on the left side "Hamburg" on the right. I would like to thank you for solving the mystery for me. Have a good New Year!

Thanks again,
Ron