I received this piece along with an original grouping of Civil War items that I purchased on Ebay. A friend suggested that it might be a tompion for a cannon. I did some measuring and the bottom portion is 2.9" or 73 mm in diameter. It appears that it would fit the bore of an 1861 10 pounder Parrott rifle perfectly. Is this a cannon tompion or something else? It is made of wood. Thanks for any help offered.