First I would check the model number of your winchester shotgun.The correct model number is 37.Winchester made the model 37 single shot from 1936-1963,with 1,015,000 made during this time span.Th red letter reference is only to the model 37 shotgun.While many of these were made over the years,Winchester never kept records on these shotguns because they were made with no serial numbers.A firearm serial number was only required after the gun control act was passed in 1968.
Do you mean a Winchester model 37 single shot shotgun in 16 gauge?If so then your red letter shotgun will bring between 120-300 dollars based on the shotgun having between 70%-90% of its original finish.
That will depend on the Model of shotgun you are asking about,along with the overall condition of your Winchester shotgun?
Your Winchester model 12 shotgun was made in the year 1925,with the serial number that you have provided.
Serial numbers 779456 thru 814121 were built in 1939 with a total of 34,666 built
Your winchester model 12 shotgun was made by winchester in 1953.
Your winchester model 12 shotgun was made by winchester in 1937.
Your Winchester model 1897 shotgun was made by Winchester in 1910.
Your winchester model 24 shotgun was made by winchester in 1947.
Winchester did not make a shotgun chambered in 25 gauge,as a matter of fact there has never been a 25 gauge shotgun made.Available chamberings were 12 gauge,16 gauge,20 gauge,28 gauge,and 410 gauge.
Winchester
The Winchester Model 12 16 gauge shotgun, with serial number 1779186, was made in 1918. This is according to the information released by Winchester.
Your winchester model 12 shotgun was made by winchester in 1953.