U.S. Model 1855 Sword Bayonet converted to Knife, Handmade Scabbard

This is a U.S. Model 1855 Saber bayonet - used extensively during the Civil War - originally on the US Model 1855 Percussion Rifle. These rifles and bayonets saw hard use. This one has very obviously been converted to a side-arm, and is about the size of a good Bowie or hunting knife. Very crude shaping of the blade, but clearly a reduced bayonet blade; handle has obviously been removed and re-positioned at some time and is held in place by a model nail. Solid brass hilt and steel blade are battered and worn (see images).
Overall length is scabbard is ~14-5/8"; overall length out of scabbard is ~14-1/2"; blade length is ~9-3/4".
Scabbard is handmade and I cannot determine age; it is leather and crudely hand-stitched with leather and wire.