Hello, I try on this one...
Here in Europe, a ZM PPK in good condition (about 95%, but not NIB) will go for some 500 euros. Special features - 90 safety, original accessories (box, rod, blank cartridge, Walther patch, manual, metal box, oil bottle) will bring a bonus.
Genuine nazi markings - RZM, RFW and so on - are another story...
Bye.