Bayonet identification help

[patio]

Think this is for a .69 caliber conversion from smoothbore to a rifled musket.

shank length 2 5/8 inches
OAL 20 1/2 inches
socket ID .845 inches
marked U.S.

Any help is appreciated.

Thank you,

Pat

[Grayrock Volunteer]

It is a M1835/55 replacement bayonet for Model 1840 and Model 1842 muskets that were missing bayonets. These will also fit on Leman altered M1841 Rifles.