Ron, I like how they went 'around' the crown N, too often the stamp is right over it.
So, commercial that went into army at some point
I don't remember seeing a P like this before, and the only grips I remember seeing
with all 4 of the serial number is a Simson. Not sure I think its a simson rework, but anything is possible. However, the "P" makes me think that a unit had two of the same serial number, and the P was placed to make it stand separate?
ed