John Dickson & Sons is Scotland most famous gunmaker. Established in 1820, Dickson first made a name for itself in the 1840s with their fine “Improved Two Grooved Rifles”, a modified version of the British Army’s Brunswick rifle. Later in 1880, the company patented their famous Round Action trigger plate shotgun. In between, they built the 10 bore hammer gun you see.
This double was sold by Dickson in December, 1875, and it looks very original. As you can tell from the specs, it’s big, heavy gun, probably made for pigeon shooting or waterfowling. I would love to get my hands on it and find out how those 32″ barrels feel.