🔎 UNIDENTIFIED What is this!

[Eric B.]

Found this about 6 inches deep in a grass parking lot across from the county fairgrounds.
Brass and has a "keyway" on the back.
Any idea what it is? Thanks!
Lettering may say
LD SHAM
PAT 1905

 

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[CreekSide]

Idk maybe someone else will

 

[Peyton Manning]

I’ll guess half of the butt end of a knife

 

[Back-of-the-boat]

Possibly half of a cable lock/ as in a clamping style of lock?