How much is a diamond arms co single barrel shotgun made in the late 1800's worth?

The value of a Diamond Arms Co. single barrel shotgun from the late 1800s can vary significantly based on its condition, rarity, and provenance. Generally, these shotguns can range from a few hundred to a couple of thousand dollars, with well-preserved examples or those with unique features fetching higher prices. To get an accurate appraisal, it's advisable to consult a firearms expert or a reputable auction house specializing in antique firearms.