Contact Winchester Customer Service through their website.
No known web site.
Follow this link to contact Winchester, and request a manual: http://www.winchesterguns.com/customerservice/ownersmanuals/index.asp
Try eBay, most of the copies are reproductions but they'll have all the info.
Try contacting the maker.
You can download one from the Browning website.
Go here - www.remington.com/literature_request/literature_request_form.aspx
The Sears 2C was made by Winchester and is basically the same as the Winchester Model 131. Owners manuals might be found online at one of the auction site like eBay or GunBroker. We have parts available. sales@countrygunsmith.net
A Sears Mod 53 is a Winchester Mod 70. If Sears doesn't have an owner's manual for the 53 (and you can't find one on eBay), go here http://www.stevespages.com/page7b.htm for a Winchester manual.
If you are looking for the owners manual go to the Crosman home page and click on "download a manual" you will find the 500 owners manual there.
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.
For the information go to http://www.stevespages.com/page7b.htm To get an original manual, try eBay
Start with Winchester Customer Service. Winchester has made THOUSANDS of different models, and we would need to know which model to offer more help. Sort of like where to find a manual for a Ford truck.