The knife does take the form of a much earlier period. You could wonder at what response it would stir if being sold with no information on ebay. The questions of condition and brightness of the brass elements could be off putting? It is a very nice piece. These links help show that not all genuine pieces have to look old.
http://furtradetomahawks.tripod.com/id4.html
http://furtradetomahawks.tripod.com/id45.html