O.K. here we go... this is what I know about this blade:
1. its a cut-down M1891 Carcano bayonet, that is really reworked! SN "ORD" prefix still visible.
2. USPCC "Uncle Sam" pattern card made during WWII and in 1965, is under the acrylic grips.
3. I would just call this a WWII Theater made...