Hello, My name is Margaret Oliver. I have an old iron skillet which belonged to my great grandmother. On the back it has engraved OZARK St. Louis Missouri, Union Made, 258. I don't see anything about Crescent Foundry. Can anyone tell me when this was manufactured? My great grandparents lived near St. Louis in a German community in Illinois, called Staunton. They were there from the early 1880s until the early 1950s.