Hi Carolyn,
This link is to a thread with photos on one of my Parkers.
http://parkerguns.org/forums/showthread.php?t=1821
Notice in the first photo the forend (top left), receiver (top right), and barrel flats.
The part of the receiver with the numbers and letters is call the watertable.
The watertable markings along with those on the barrel flats and recoil lug (part that extend downward from the barrel flats will tell us much about your gun. See 2nd photo.
Mark