Cast Iron Chicago Skate Key. One Stamped C S. From what I was able to research, it looks like cast iron, the smaller one could be brass. They both have a square socket. I was told they were for roller skates or ice skates from the 1940's or 1950's These are heavy old keys. The one has C S stamped on the top on both sides. On the shaft, I can make out ALL and under it ON and on the other side it says 1 2. It has a little nick in it. I tried to take a picture of it. Thank you for looking. If you have any questions, please ask before you bid. I will answer as soon as possible.