Your question can not be answered for several reasons: You state that it's (Prewar) Which war? You did not state the model. Winchester has several models. You did not state the condition of the gun. In fact Winchester has never made a gun only rifles. Your question is too vague.
1866
Oliver F. Winchester founded the Winchester Repeating Arms Co. in New Haven, Connecticut in 1866.
north haven conn
The Winchester Model 1400 was manufactured in 1964. This was one type of gun that replaced earlier Winchester models. Winchester Repeating Arms Company was founded in 1866.
Start going to gun shows.
Winchester Repeating Arms Company was founded in 1866. It originated from the New Haven Arms Company, which was established in 1856, and was acquired by Oliver Winchester. The company became famous for its lever-action rifles, particularly the Winchester Model 1873, often referred to as "the gun that won the West."
To acquire a letter of authenticity for a Winchester gun first contact the company website and inquire about receiving one. Another option is to locate a gun expert or appraiser and ask for a letter of authenticity.
Winchester are a pretty old gun firm so take it to a gun dealer or an antiques trader they might be able to help or just call the company
Rifles, shotguns, handguns, machine guns. Mainly rifles and shotguns.
depends Springfield 1800.Winchester 1825.Remington 1850
I would always start my search at Numrich Gun Parts Corp.