Carabiner shaped relic?

[OFRRD777]

Title and pictures say it all. Some type of horse tack? Looks like it broke off from another piece. Any help is appreciated.

 

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[Mackaydon]

Maybe a rein guide.
Don....

 

[creskol]

being not much bigger than the penny, seems too small to be horse tack.

 

[Tony in SC]

Looks like a haimes ring/loop?