I have recently purchased a muffin pan in a store that sells estate items. It is shiny silver (with some wear) on it. On the top, on the left side, it says "HERCULES" and under this is says "WARE" and under this "B'klyn-6 NY". In the center of the pan, it has U.S. and this is circled. There is another circle on the center right side that had 1951 inside of it. I have done so many searches and can't find anything about this. Can anyone help? Thanks!!!