These bayonets are the first true M1 Garand Rifle bayonets and were manufactured during WWII. They are basically shortened verions of the US Model 1905 and the arsenal refurbished bayonets designated the US Model 1905/42; however, they are more closely related the interim bayonets designated the US Model E1 that was used on the Springfield 03-A3 and the M1 Garand Infantry Rifles during WWII.
A very close copy of this bayonet was also used by Denmark and is believed designated the Danish Model GM50 to fit their US Model M1 Garand rifles.

This particular bayonet was manufactured by Utica Cutlery (UC).

These bayonets are well made. The grips are black plastic; blades were either Parkerized or blued. The blade is ~10" in length, steel, with single-stopped-fuller (both sides), single-cutting-edge with short false-edge towards the tip, spear-point tip.
Blade ricasso is stamped with the maker - in this case U C - over ordnance bomb, over U S.

Scabbards are the M7 designation, green "plastic" but more accurately classified as fiberglass; sheet-steel throat displaying US centered in ordnance bomb logo.

During the Korean War, this bayonet was found to be very difficult to remove from a rifle while the hand was gloved. As a result the US M5 Garand bayonet (and variants) was designed. This was a total redesign and looks nothing like the original M1 Garand bayonet.

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