Knife bayonet for use with the .303 caliber Short, Magazine, Lee-Enfield (SMLE) No. I Mk. III rifle.  The SMLE was the mainstay of British forces during the First World War and also saw extensive use by Commonwealth countries during WWII.

This example is a commercial contract piece, bearing only the Wilkinson trademark and no British government or military markings.  It is undated, so date of manufacture is not known. It was sent back from the war in Afghanistan by U.S. Army soldier in 2006. Note the Dari writing on the upper and lower tang.

The scabbard is the Mk. I land pattern, missing the leather belt hanger.