A lot of the early 16 inch M1905 bayonets, originally issued with the M1903, as well as the WW2 made 16 inch blades, were cut down to 10 inch length to match the length of the WW2 made M1 bayonets. The early M1905s made by Springfield and Rock island were serial numbered. There is a pecking order on value with the uncut M1905s and early WW2 16 inch blades at the top. Some WW2 makers were scarcer too.