Really awesome piece of wood. I kind of suspect the two inlays on the butt were probably (much) later additions, but it's impossible to tell much from those photos. I don't think it's that 'early' but we all have a different definition of exactly what constitutes early. Just looking at what I can see of the side plate, I suspect late 18th century at the very earliest and perhaps even into first decade of the 19th. Wood like to see more.