What is the value of Harrington Richardson single shot shotgun breech action 12 gauge model A407103?

The value of a Harrington Richardson single shot shotgun, specifically the 12 gauge model A407103, can vary based on its condition, age, and market demand. Generally, these shotguns can range from $100 to $300. For a more accurate valuation, it's advisable to consult recent sales, a firearms appraisal expert, or a local gun shop.