I see a clue on the box....I think it might be a P7.
It's not an "M" series P7 (M8, M10, M13) etc. Price? $699-$900 pending on what it's been refinished in and number of mags. As for year, that depends on S/N which I can't see but I can tell you it was made after the Berlin Wall came down as it's marked "Germany" not West Germany.