swing plate

I found this today in the same area where I’ve found 2 colonial-era flat buttons and the Hudson Bay Company beaver token I shared recently. Sand/gravel bar, eastern Iowa. I think it’s a lock swing plate. It’s marked with a crown and G R, and I assume PATENT but it almost looks like the P is...

I found this today in the same area where I’ve found 2 colonial-era flat buttons and the Hudson Bay Company beaver token I shared recently. Sand/gravel bar, eastern Iowa. I think it’s a lock swing plate. It’s marked with a crown and G R, and I assume PATENT but it almost looks like the P is...