What is this square item?

[MackDigger]

The patina looks to be old and it was found at a site that produces LOTS of 1800s relics. The quarter is a size reference and any help/guesses are appreciated. Thanks for looking.

 

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[OWK]

I would guess it is a tin-type photograph frame.

 

[Mud Hut]

yup

 

[OWK]

 

[OWK]

I think the frame above, might be your actual piece.

 

[Red James Cash]

give the man a ceegar

 

[Red James Cash]

the points in the corners are sharper in the frame mackdigger found.