The one thing I can definitely say about your gun is that the only thing it has to do with America is that it's here.
As others have noted, it has definite North African/Asian characteristics that never showed up on European produced firearms.
The type of lock also fell out of use in Europe, being replaced with better designs, many years before the start of the American revolution, but remained in use in Africa and Asia even into the 20th century because they were easy to make, easy to fix, and were traditional.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.