Brass ring thing?

[CivilWarSaver]

Hello again, today I metal detected at my great-great-great grandfather farm again. He lived there from the 1880s to 1954. I found a lot more items, but I was wondering if anyone knew what this ring could be? Thank you!

 

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[CivilWarSaver]

I’m thinking a washer or something off of a T Model Ford

 

[CivilWarSaver]

Bump

 

[CivilWarSaver]

Here’s another picture if it would help

 

[roy2bears]

No idea

 

[CivilWarSaver]

Also on the back it has four small light circle impressions on each side

 

[CivilWarSaver]

Bump