I have tried to figure out what this is but as of yet I haven't, I found it this spring in a park that was excavated a few years back soon after our first thaw this year. I am sure it's at least as old as 1920 cause it was right with remnants from a dump that was there before they made it Upjohn park in 1920. There was also a lot of ash in the area I found it. It looks Masonic but most of the mason's that have seen it say they don't really know what it is.