How much is a Iver Johnson 20 gauge single shot shotgun worth?

The value of an Iver Johnson 20 gauge single shot shotgun can vary widely based on its condition, age, and specific model. Generally, prices can range from about $100 to $500. Well-maintained or rare models may fetch higher prices among collectors. For an accurate appraisal, it's best to consult a firearms expert or check recent sales of similar models.