Where do you find the date of a Iver Johnson single shot 410 gauge shotgun?

To find the date of an Iver Johnson single shot .410 gauge shotgun, you can check the serial number, which is usually located on the underside of the barrel or the frame. Iver Johnson produced shotguns from the late 19th century to the mid-20th century, and specific serial number ranges correspond to production years. You can reference Iver Johnson production records or consult a firearms expert or collector's guide to determine the date based on the serial number. Additionally, Iver Johnson Firearms often have patent dates stamped on them, which can provide clues about the manufacturing period.