The year made is 1939. What kind of shape is it in? If original with good bluing and good wood, you'll do ok with it. Depends if it is a field model or trap? Is it engraved? What type of presentation model.
Receiver/barrel
Check the receiver and barrel
On the barrel.
barrel, tang, receiver
Check the receiver and barrel.
Check the receiver and barrel area.
Check the receiver and barrel
Check the receiver, barrel
Check the receiver and barrel
Please include the model number of your Winchester shotgun to get a correct answer to your question along with the serial number.
on the bottom of the barrel and reciever.
Barrel and receiver are the most common place.