Your Parker Bros. shotgun was made in 1925.
You need to give the serial number on a Parker.
$3500.00 $3500.00
.1 cent
A few hundred to a few thousand.
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.
Any good gunsmith can find or make parts for your shotgun. It might take several weeks to a year or more. Parker Brothers are a top of the line shotgun, and a shotgun in working shape is worth more than a broken one. Do some checking around at a local gun show, or surf the web for parts.
Contact the major gun shops
Parker brothers table tennis
Very late in the 1800's
Check your phone book for gun shops