Brass Civil War relic?

[HuntingRelics]

Can someone help ID the brass piece? Next to an enfield for size reference. My first thought was piece of a skeleton key...

 

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[creskol]

broken key

 

[invent4hir]

Part of a broken off skeleton key(?)

 

[Tony in SC]

Your first thought was right!

 

[BLK HOLE]

Yep, my first thought was the end of a skeleton key.