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Actually I inherited a smoothbore musket with a bayonette with a powder bag, some cotton plugs, and lead balls. It's in awful condition and jammed, never tried to unjam it. It's complete but looks like someone hacked wood with the bayonette, the carry bag is brittle leather, the wood is marked and chipped, and it's a little rusty. I nailed it in a box and it's been sitting in my attic under the insulation for years. The value of such a thing in it's current condition is dubious.
It may predate the Springfield 1818 or something else but I can't read the plate and it's definately smoothbore and there is no percussion cap capability. I think it's American but it does look a lot like the 1777.
It has that notch in the wood in the back like the 1777 but it also has the long loader stick with a hemispherical end.