To appraise a shotgun like this, one would need the gun to examine & that appraisal would run about $200.00 to $250.00.
You need to give the serial number on a Parker.
Your Parker Bros. shotgun was made in 1925.
$3500.00 $3500.00
.1 cent
A few hundred to a few thousand.
Yes, they made 242,487 shotguns between 1869 & 1942.
Since the Parker guns have been out of production for over 50 years, I would start with the Parker Collector's Association.
It would top out at $250 as a mantle decoration. Unless you mean a Parker Brothers shotgun. Then it could be several thousand dollars.
Cabn you send pics ? Can you send pics ?
Contact the major gun shops
Parker brothers table tennis
Check your phone book for gun shops