found this thing in a city lot, some type of relic that I believe was a topper for something like a wood burning stove. The item is between the shell and the state insurance sign...thanks for the help. Ill post all the pics of what I found that day.
It seems to be cast and non magnetic, thanks for the lesson never herd of a finial until now...cool Sorry for the miss information it now seems to be brass and it does have threads on the inside of a hole on the bottom.