Flea Market Find a Mosin-Nagant 4 side Socket Bayonet

I got this Bayonet at the flea market today, something I don't know too much about, but the seller thought it might be Civil War, and I have friends that do Civil War Re-enactment, so I thought it might be something that they might like. Well I found out it's not Civil War, but a Mosin-Nagant Bayonet for an M. 1891 Rifle made for the Russians during WWI, 1915-1917, by Remington 840,310, and Westinghouse made 770,000, delivering 133,400, and 225,260, but with a change in the Russian Government, the new one would not honor the contract, so the USA bought them to use for the Military, for training mostly, through WWII.
I'm not sure when, or who made this Bayonet, there were a lot of different design changes over the years, and many countries used the M. 1891 Rifle. This one is 14 1/2" total length, with a blade length of 11 3/4". It's got a 517001 on one side of the hilt, and a circle with 2 lines on the other side, no other marks that I can make out. There's some bluing left on the blade, that goes to a flattened point, not a screwdriver tip