Methinks you ran across a great pistol in Grade A condition at a great price.
Last one I bought (probably 4 years ago) was a Grade B and I paid (IIRC) $600-650 for it. It was definitely not the nicest one I have seen or owned, but it scratched my itch for a while.
P7s are great guns. I bought my first back in 86 or so, and have owned six or seven of them through the years (including two M10s and an M13). I always end up selling the one I have, then a while later, buying another.
Been a while since I've owned one, and I find myself paying more attention lately to P7 threads and P7s for sale...