ASO FOOTED BLACK CAST IRON TRIVET 5-21 For Sale

Here is an old footed trivet in the shape of an iron. I couldn’t find much information on this one,but from what I gathered it’s rare. Itis marked on the bottom “ASO, 5-21” with a symbol I can’t make out. It is in good condition with some wear (paintloss) at the point on the front. (seephotos) It measures about 4¼ x 10½inches.