Hey fellow treasure hunters! Please help identify!

[Shark.tooth]

Not quite sure what this is. My first one like it. 1800s-early 1900s cellar hole.

 

[firemanphob]

Could not find the exact one but I think it could be the one on the lower left with the part missing.
https://ia800300.us.archive.org/Boo.../catalogueno200jmei_0138.jp2&scale=4&rotate=0

 

[Shark.tooth]

Thank you it does seem to resemble that!

 

[randazzo1]

Looks like a gasket maybe. It’s iron, right? Maybe piece of iron furniture from a door or box or something.

 

[bradyboy]

part of a pump flapper valve?

 

[Georgivs]

Looks like maybe harness hardware. Perhaps a breast collar ring?