mystery artifact

It's been a few years since my last request for help, but I know this is the place to come to for the pros to figure out. Found all three items in a sandy soil matrtix within a 30' dia. The middle, Victorian looking item is 6.25" X 3.5", probably stamped copper, weighs 50g or 1.8 oz. The heavy...

I recently found this on a large island in the Mississippi River in Iowa. It was on the exposed clay layer that is underwater a lot of the year, so there has been a lot of wear from sand. I’m pretty sure it is a celt but wanted to get the opinions of people on here who have more experience than me!