Winchester has made millions of shotguns, I believe the first in 1878 and the last was finished a few minutes ago. You could try a guidebook. Or, try asking a more specific question here. If you give the model name or number someone may be able to give you a range of values from a parts-gun to one in 100% new condition.
over 500
Your winchester shotgun was made by winchester in 1899.
As for the age of your Winchester model 1912 pump action shotgun.It was made in the year 1961.As to the value,that would be based on the amount of original finish remaining,and a good bore.Without that info supplied I would not be able to ascertain a distinct value for your Winchester shotgun.
Blue Book of Gun Values
your model 12 Winchester shotgun was made in 1917,so the age is 93yrs,old.I think the best way to put a value on your shotgun is to purchase a copy of S.P.fjestad book of blue book of gun values.
The exact value of a Winchester model 120 Ranger 12 gauge shotgun with Winchoke is actually dependent upon a number of factors. Some of these factors would be the age and condition of the shotgun.
Your Winchester shotgun was manufactured in 1914.
your model 12 Winchester pump shotgun was made in 1951 as to value in fine condition I have seen them from 550.00 dollars and up.
your model 12 Winchester shotgun was made in 1937.so the age of your shotgun is 73 yrs.old.
Your winchester model 12 shotgun was made by winchester in 1957.That puts the age of your model 12 shotgun at 54 years of age.
Your winchester model 12 shotgun was made by winchester in 1947.
You can look up the serial number at Proofhouse.com