Found this buried in my backyard. Cincinnati, Ohio, United States.

I was digging a hole for a fence post and hit this with a shovel. I cleaned it up as best as I could. Looks like it says The Adams Company Dubuque, IA. Pretty neat cast iron piece. No idea how old, or what to do with it. The closest thing I could find while searching online was a similar piece from the same company from 1887.