Curious if according to - Walther PP & PPK postwar production copy.pdf - if this was truly made between 1964 and 1965? Looking at many pictures I have not seen similar markings on other pistols. The pistol is on poor shape in my opinion, though shoots every time. I have owned this pistol for about 10 years. Any knowledgeable information is very appreciated. Condition, Rating, Value, Year, Origin?