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blunderbuss
No reference lists J Manton.
27p
If you're lucky about £400.00
The value of a J Manton and Co double barrel 12 gauge shotgun depends on a couple things. Some of which, would be the age and condition of the shotgun.
50-100 USD
Try gun shows, want ads, gun shops, google.
Although it sounds a bit like buzzard, a blunderbuss was an early firearm that was distinct from a rifle. It had a barrel that widened at the muzzle, which dispersed shot or other projectiles as in a modern shotgun. Its design also made it easier to reload with powder and shot, especially on horseback where a rod was often impractical.
it is 114 =[)
1795-1870 or so
From a book: THE SHOT GUN & ITS USES By "East Sussex" (First published in London in 1914.) says on page 2: "About 1800, however, the double-barrel shot gun was taken up, if not introduced, by Joe Manton..."
No, it is British.