I purchased this Bayonet at an estate sale...I don't know much about Bayonets but here's what it reads: On the blade it reads S.A 1918 on one side & U S 830348 on the other side.....There is a small circle on the scabbard that reads U S...Its hard to see but can be seen with a magifying glass...I didn't want to clean it up real good but some collectors like patina left on...Bayonet is 16" overall and blade is 9 7/8"...I don't have a lot of information about this Bayonet but if you want to help me out, please sent me a message...Thanks