Without the sn and a detailed description it could date from 1912 - 1980 and be worth a few hundred or tens of thousands.
1955
The Winchester Model 12 was never sold under the JC Higgins name.
I cannot answer that question until you provide the serial number to determine the age of your Winchester model 12 shotgun.I cannot determine the value without you describing the overall condition of your shotgun.
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.
over 500
Proofhouse.com has sn data.
Your winchester model 12 shotgun was made by winchester in 1928.
You can look up the age by selecting model 12 then entering the serial number at this site: http://armscollectors.com/sn/winlookup.php
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 Winchester model 12 was made in 1970.
Your winchester model 12 shotgun was made by winchester in 1939.
your model 12 Winchester shotgun was made in 1914.