CANADIAN ROSS BAYONET Mark I (Pattern 1905/1908) manufactured by the Ross Rifle Co. in February 1910. It has the rearward extension of the muzzle ring. Scabbard is the Mark I manufactured in 1909.
USA markings have been stamped in both the grips and scabbard (Flaming bomb over US) The belt loop also shows what appears to be the battalion details it was issued to. (Reference WW 108 and BCB C4)