✅ SOLVED What is it?

[No gold in NY]

My detector picked this up on an 1860's property I am working. Soaked it in vinegar for a while and it looks like it could have been silver plated. I touched a corner with a file, and it appears to be brass. Thanks for any help.

 

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[creskol]

Cool! We are seeing a rash of these sash buckle halves showing up here lately, and I love every one of them! Nice find!

 

[Rookster]

Maybe a heater vent although brass has a lower melting point than iron. Maybe a front door viewing port. Lots of possibilities. Nice find.

 

[creskol]

The back of yours would have looked like this in its complete state:

 

[No gold in NY]

The back of yours would have looked like this in its complete state:

Thanks creskol. Makes sense to me.

 

[Professor of Engineering]

Congratualtions!