Please help Id this Bayonet stamped US

[mwrookie]

Hello,

Can someone please help me ID the following bayonet?

Information

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[green]

Looks like US M1855 or 1873 Springfield bayonet, differed on the muzzle size.

[gsimmons]

It looks like a Model 1840/42 bayonet. What’s the inside diameter of the socket?

[gew8805]

Yes, a M1840/42 bayonet.

[mwrookie]

Thanks for the help everyone. I will put a mic to the inside of the socket tomorrow and post pictures. I have another that is similar, but is not stamped US.

[mwrookie]

The mic measured .8050 from the inside

[butlersrangers]

It appears the bayonet lug would have to be on the bottom of the barrel, so 'fixed' bayonet blade would be on rightside of barrel. Also, bayonet is missing its locking-ring.