This is a sword bayonet was manufactured for the Remington Contract U.S. Rifled Musket Model 1862. It very closely resembles several other bayonets made in the U.S. just prior to and during the Civil War.
The most distinctive part about the bayonet - for identification purposes - is the cut of the bayonet-lug attaching slot.
These were manufactured in the U.S. by Remington and are stamped with various inspector's intitals. I have never found an example stamped Remington.
Blade is made of steel, grips are of cast-brass and ribbed; attachment sping is on the right side.
Scabbards were of black leather body with brass throat and drag.

Please Note: These are currently being reproduced and offered by various distributors. Beware of these being offered as originals by secondary sources.