This bayonet is an original WWI-era US Model 1905 in a correct WWII-era scabbard. They were designed to fit the US Model 1903 Springfield (aka Springfield '03) series of bolt-action rifles (based on the German Mauser). This bayonet was later used - in cut-down form - to be used on the US Model M1 Garand Semi-Auto Infantry Rifle during WWII.

This particular one was manufactured at the Springfield Armory in 1907; they were manufactured at the Springfield Armory originally from 1906 to 1922 and at the Rock Island Armory from 1906 to 1913. In 1942 these bayonets were altered, grips were changed from wood to black plastic; blades were blued or parkerized. These altered bayonets were termed the US Model 1905/42.

They bayonets are well made, all steel, with wood grips. The hilt configuration is considered a "bird's head" pommel with the standard push-button/integral spring latch, steel crossguard; wood grips are held on by a single screw.
The blade is steel, single-stopped-fuller (both sides), single-cutting-edge with short false-edge towards the tip.
Blades are marked US over a serial number on one side of the ricasso; arsenal over ordnance bomb over a date - between 1906 and 1922 - on the opposite side.

The original scabbards were in several variant forms, including leather-covered wood; canvas-covered wood (that was wrapped in a stretch-skin for water-proofing; there were also seceral belt-hook variants, including the standard web-belt hook and the "Krag-style" swivel belt loop. The scabbard with this example is the WWII variant - green "plastic" (but more accurately classified as fiberglass); sheet-steel throat with displaying US centered in ordnance bomb logo.

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