The Y series model 12 shotguns were made from 1964-1980.This will depend on a more detailed description of your shotgun.Please include if any engraving is present,if it has a jeweled bolt,vent rib barrel,overall condition of shotgun to include amount of blueing remaining,and bore condition.
No such shotgun model number/
This gun is worth about 800.00
The Winchester model 70 Black Shadow is worth between about 600 dollars and about 800 dollars depending on the condition and exact model. This gun is a relatively newer model by Winchester.
The value of a Winchester model 75 will vary depending on the condition of the gun. There are some of the models worth $1250.00.
A Winchester Model 140 12 gauge, semi automatic can be worth up to $150. The exact amount that the Winchester is worth depends on the condition of the gun.
300 or less depending on condition
Your Y-series gun was made in 1973.
You need more info about the gun. Gauge, deluxe,standard,and so on
See professional appraisal. Only @600 made
50-300 USD depending on condition
A Winchester buffalo bill comm.rifle or carbine are worth 595.00 dollars,if they are new in the original box and unfired.
The Winchester model 20 was a youth .410 single shot gun manufactured between 1918-1924. Only about 24,000 were built. Your serial number is not from a Winchester model 20.