Banjoman
Hillbilly
I think the key is ‘how common’ were they. Were buffler plentiful enough in the late 18th century western North Carolina or East Tennessee that a backwoods farmer could easily find one or would it have been easier just to use a cow horn? I think it’s possible that a buffalo powder horn could have been made in the 18th century and survived till the mid 19th century. But how common would it be?