This is a knife/sword bayonet manufactured beginning 1917 and was used on several firearms to WWII. They are very similar to their predecessors: the British P1907 (muzzle-ring is closer to the blade rib and does not have U.S. markings) and the US/British Model 1913/17 (has the same dimensions, but does not have the U.S. Ordnance Bomb on the ricasso). The Model 1913/17 will interchange with the Model 1917 but not with the P1907. These were manufactured for the U.S. "Enfield" or "Eddystone" .303" caliber rifle (not to be confused with the British No.1 SMLE series which accepts the British P1907 Bayonet). Bayonet examples made in the U.S. are stamped "U.S.", dated "1917," and stamped with the U.S. Military "ordnance bomb" (aka "flaming onion") logo above the "U.S." Manufacturers were Remington and Winchester (the latter being quite scarce). Blade is made of steel, grips are of wood with two horizontal grooves cut into the sides; pommel will havean "oil-hole." Scabbards were either green (olive-drab) fiberglass with steel throat or green leather body with steel throat, drag, and belt hook. Remington (in circle) made these bayonets in 1917 or 1918 (total production was about 1.5MM and the 1918 marked run was thought to be about 50,000 to 100,000). About 545,000 of the early 1917 bayonets used the P-13 Remington British bayonets (dated 1913) and added the US surcharge markings and 1917 dates (no oil hole in the pommel). If made by Winchester (about 396,000 made) in 1917 (W in or out of a circle), prices range from $150-$250 (R2+). The scabbards were leather with metal fittings with the leather marked Graton & Knight or Jewell with date (i.e. 1918).