There is a very small "D" or maybe it is a stylized "A", and some kind of symbol I do not recognize. But not a circle P. I have a pretty good picture of the stock in that area, as well as 3 of the ends of the dowels used in the repair of the stock crack.
If you can see my gallery it is one of the 4 test photos. I can also send you (and Jim) an email attachment. Or maybe, once I get ino some research, I will find out that it is well known, just not by me.
Cheers
Warren