Proofhouse.com has sn data.
You can look up the serial number at Proofhouse.com
Look on bottom of receiver and barrel
Depends on the serial number... Look up Winchester serial numbers..
Look at the receiver
oldguns.net
I posted a hotlink under the "related links" heading below.It's a database where you can submit the model and serial numbers and look up the date of manufacture.
If you have a common shotgun made before 1968, there probably is no serial number to look up. If the serial number is not on the receiver some where; i.e., water table, side, bottom, somewhere; then it doesn't have one & that is as far as you can take the serial number of a shotgun made before 1968.
Go to Proofhouse.com and look at the Winchester sn data.
barrel, tang, receiver
look on the breach, barrel.
Not knowing anything about the gun, the same answer applies to all. Google 'Winchester serial number look up' and then put in the serial number on the site once there.
Go to Proofhouse.com and look at the Winchester sn data.