Thank you to everyone for figuring out my gun
 

Everyone has been so great in picking out what this shotgun is. I knew it was a beautiful gun and both my father and I treasured it but everyone here has been great decoding the numbers and letters. I am attaching 3 pictured that show what I have found with your help. There is one number I don't know yet. Please correct me if I am wrong on my findings.

First picture shows:
serial #217264 made in 1926
Grade 8
A1 Special
Patent date

Second picture shows
Parker Peerless steel logo on each side
Weight of barrel
Grade 8
Unknown stamp above the Peerless logo
Unknown #7
Gauge 12
Frame size 1 1/2

Third picture shows:
Serial #
The unknown 7

The one "unknown" in picture 2 is J.G. in an oval, the initials of Jim Geary foreman of the barrel shop.

Thank you so much. Now what is the 7 for?

Picture is almost filled in.
 

Here is the update of Picture 2. Thank you

Unknown is Unknown and will probably always stay that way. Anyone who would know is now dead.

Thank you misteries maybe are as much fun as knowing