"From 1865 until the late 1950s, the Griswold Manufacturing Company of Erie, Pa. made various cast iron implements for home use, including many types hardware. Their selection of cookware included skillets, muffin pans, roasters, bread molds, waffle irons, kettles, dutch ovens and even miniatures. These pieces stood the test of time and are the items most often found by collectors today. Since they were usually made with black iron, collectors easily recognize them today. The distinctive mark on the back of each piece frequently confirms a Griswold find, but the company actually used a number of different signatures during the life of the company." http://antiques.about.com/cs/miscellane ... 013000.htm
a number 13 could bring several thousand bucks!!!