✅ SOLVED Rosette? Horse Tack?

[ripvanb]

I found this object in a field. My first thought was Bridle Rosette, but it appears to be one piece of copper. Could it be some other form of horse tack or something completely different. I don’t think it is all that old as it’s stamped with letters and numbers. Any thoughts?

 

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[desertexplorer]

It’s the remains of 1936-41 Ford V8 flathead 60 bellows style thermostat. You can see where the bellows was originally soldered to the one side of it.

 

[ripvanb]

Thanks for the ID!! I would never have guessed it.