Keystone Food Chopper food grinders were made for a very long time. The dating of the skillet, only seen in a size 5 and apparently some kind of promotional tie-in, is not certain. Some have heat rings; the smooth bottoms look like the HR was just removed from the patterns. The smooth bottom design and that of the handle suggest 1930s to as late as 1950s. The handles are very Wagner-like, but that doesn't necessarily mean Wagner was involved.