This embossed, rather 3D smiling sun face looks to be made of iron or heavy pot metal. It is 2.5" in diameter and I believe with its loop design that it is part of a buckle or belt kit.
This little sun has great possibilities for Assemblage Art work with its whimsical expression. I'd use it as is - its finish is perfect for this type of work. I'd adhere directly to the canvas and see it as a focal point although it would be of great interest in a larger work as well.
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Disclaimer: I'm not an expert on the "found objects" you’ll find here at Art Creations by Vicky. Condition isn’t a consideration as I look only an object’s potential as a piece for Mixed Media Assemblage artwork.