Really good place to start is www.midwestgunworks.com
Start with this site www.midwestgunworks.com
The Winchester model 101 over-and-under double barrel made in 1963 is worth about $800 to about $1500 depending on its condition and features. The serial number of this gun would be helpful when determining value.
try www.midwestgunworks.com I found the 101 manual here.
Check the receiver and barrel
Check the receiver, barrel
A Winchester 101 shotgun was used primarily for hunting. The best and most accurate way to find out the value of a firearm is to check with a gun dealer.
You will need to take it to a gunsmith or machinist to find out.
On the barrel.
Your winchester model 101 was made in 1966 by winchester.
Your Winchester model 101 20ga shotgun was made by Winchester in june,of 1966.
What is the value of a Winchester model 101 bought new in 1964?
I have one that I would sell.