This is model 1913 bayonet manufactured by Remington for the British in April 1917 With a mint blade. The blade is parkerized which I believe was done over the original finish which was usually a dull gray sandblasted finish.Note how the markings on the ricasso does not have the bend test mark which is an X. Scabbard is original from 1918 and is the second pattern with a tear drop hanger. Estimated value $ 200