There are several air gun repair shops around the country. I would search the net under "Air Gun Repair" for one closest to you. Most manufactures only carry parts for their guns while they are in production. Many shops buy up these spare parts and keep on repairing air guns that are out of circulation. However you can contact Winchester and let them direct you to a repair shop.
I can only assume that you are speaking of winchester,s model 1890 .22cal pump rifle?If that is the case then your rifle was made in the last month of 1923.
Crosman still has some parts available for this model. See the link below.
It would help if you stated the model number. Crosman made several pellet rifles for Sears. You need to provide more information.
Any where from $20 to around $150 for a BB model. However a Pellet model can cost up to $3.000 for an Olympic class Pellet rifle.
This is a .177 pellet rifle.
Your best bet is to do a web search for 'air gun repair" and locate someone near you to repair it for you.
It all depends on the model, the type of pellet and the power plant in the rifle. They are not all the same. FPS Stands for "Feet Per Second" The Speed that the pellet or BB traveles when fired from the rifle.
Go to ( See the link below ) and find your parts and owners manual for your gun or rifle. Crosman keeps a web page for older airguns.
It's a 16 shot BB repeater or a SINGLE shot pellet rifle
Daisy made a model 120 pellet rifle from 1984-85. It was made of by El Gamo of Spain.
The Winchester model 425 was made for Winchester by "Meyer & Grammelspacher" of Germany. The value is determined by the condition of the rifle. without any information about the condition of the pellet rifle, no estimate of value can be determined.
If it is a JC Higgins pellet rifle it was made by Crosman or Daisy air guns. If the model number starts with 126 it was made by Crosman. (www.corsman .com) Crosman has all their manuals for parts on the web page. If the model number starts with 799 it was made by Daisy (www.daisy.com) you will have to contact them to get your information.