How can you tell what year a Stevens Model 940B single shot 20 gauge was made?

To determine the year a Stevens Model 940B single shot 20 gauge was made, you can check the serial number, which is typically located on the bottom of the receiver. The Stevens 940B was produced from 1938 to 1989, and the serial number can provide clues about its manufacturing date, especially for guns made before 1968 when serial numbers were not consistently recorded. You can also consult reference books or online databases dedicated to firearm history or contact a firearms expert for assistance.