Are you familiar with it's operation? Are we talking about a P7 or a P7M8? How do you feel about the European mag release if it's a P7?
Mags are hard to find and pricey, around $60 for a P7 mag, more for a P8 mag.
They shoot great and if well maintained will go up in value over time.
To me it was worth it to have a West German marked P7, I've carried mine a time of two but as it's blued and I don't want to refinish it it is now a safe queen/occasional range gun as I don't want to damage the finish.