Hi Bill,
I assume this is the Swiss M1929 luger you have on hold :
http://www.simpsonltd.com/product_in...roducts_id=206
If the "P" were the same size as the size of the serial numbers, then I would agree it would be a commercial gun. Those "P's" also have a " . " (dot) after the "P" as well.
The serial number on the top of the rear toggle should also have a "P", but above the full serial number.
From what I can see on the Simpson photos, your "P" is large and a bit crooked...so I think yours is the privatization release stamping...
I think $ 1750-1900 is a good price for a brown M1929 Bern luger...
Regards,
Pete...