How can you determine the age of a Thompson Model 1927 A1 Serial?

To determine the age of a Thompson Model 1927 A1, you can refer to the serial number, which is typically located on the receiver. The manufacturer, Auto-Ordnance, produced these models in specific production runs, and each serial number range corresponds to a particular production period. Additionally, consulting resources like factory records or reputable firearm reference books can help pinpoint the manufacturing date based on the serial number.