After the end of WWI Winchester still had some M1917 bayonets on hand. They were sold with guns or on their own. They are marked with the circle W and no date or military markings.
When they ran out of these leftover units from WWI, they had a stock of the 1895 Russian Musket bayonets on hand (as I recall, the order for the muskets was cancelled in the chaos of the Russian Revolution).
Rather than re-starting the bayonet line, they made the cut in the adapters and sold the musket bayonet with the gun.
They can be rather hard to find.