It's for a Model 1917 rifle made by Winchester, Remington and Eddystone which was a subsidiary of Remington. This rifle was based off the P14 which was being made by these factories for the British. When the US entered the war, Springfield could not make enough 1903's to meet the military's needs and it would have taken too long to convert these factories to make Springfields. Much easier to rework the machinery to produce the P14 in 30-06 rather than 303 and the 1917 was born. The bayonet for the two rifles is identical other than British markings on the P14's. These rifles are the subject of much argument, especially by supporters of the Springfield. It was not the "official" rifle of the US military, that was the 1903, yet it was likely more common in Europe in US hands during the war. After WWI, many were sent to Englandas lend lease, the French
also got many. They were removed from US service when the 1903's caught up and then Garand
's were adopted.