Your P grade looks in pretty good shape to me. I just got home from grouse hunting in Minnesota with a 24" PHE16. I think that just about any of us would make sure that your P is safe to shoot and shoot the bejeezus out of it as is. The bbls sound ok from your description. Check the trigger pulls to make sure there isn't a worn sear/hair trigger issue. It always helps to have someone knowledgeable with Parkers take the floor plate off to check for worn sears, corrosion, bugs, sticks, rocks, etc, which most all Parkers have if they haven't been apart for a long time, which most haven't. They can be nice on the outside and a train wreck inside and still work just fine.

I would agree with the value given previously. from the looks of the photos you supplyed about 900.00 to 1000.00.

best advise given to me long ago:

don't pay too much, but also don't pay too little...

and like the old Russian said: $5000 a dallas! its only a gon!