I found this earlier this week (nickel for size ref). I believed it was a large sash buckle and it is made of quite thick Sterling silver. I was able to get help with an ID on another forum before I am posting it here, but I thought this group would be interested.

The site where this was found is a site where population would have frequented in the 1920-60's quite heavily. This was down about 11" and rang up a crazy high tone and was a solid 39-40 on the NOX. I almost did not dig it thinking it was a big/deep copper plate or pipe or something.

See link:
https://www.worthpoint.com/worthopedia/la-pierre-signed-victorian-sterling-silver-belt-sash

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