US or French Socket Bayonet?

[Spitace41]

Hi all. I am trying to determine whether this is a US M1842 socket bayonet or a French M1847. To me they both look the same. As you can see the bayonet is in semi- relic condition and missing the locking ring. I can just make out a couple of markings on it which I have attempted to capture. If any collectors more experienced in socket bayonets could suggest what markings should be on an M1842 or M1847 that would be great. Many thanks.

[milcollector84]

It may also be beneficial to get the ID of the socket. the only US socket bayonets I have colleted are for the trapdoor and marked with US where your close up pictures are but I can not make out the marks.

Matt