Unless you have a LOT of hands-on time with MANY prewar and WWII PP-series pistols, and know exactly what you want and have the knowledge to evaluate exactly what you are getting, I advise patience rather than instant gratification.
Put the money secretly away for a while and go to some gunshows and gun shops and closely inspect as many different examples as you can find. There is a vast difference between prewar and WWII production. Education comes first, then purchase. If nothing else, you'll develop preferences and be able to discriminate among the many variations. If you are acquainted with a RKI who has some Walthers of this era, request some show and tell. At the present heart-stopping price level, it is very easy to get burned-- badly. Fortunately these models are not so scarce that you have to snatch the first opportunity that comes along.
M