I recently aquired a treadle sewing machine. It is in pretty rough shape and very rusty. We have not been able to find any identifying markings other than the words "Silent Princess" on the front. We think it might be a National but aren't sure. I would appreciate any information relating to this machine. Can anyone suggest a contact for parts or information on how to use the various feet. It came with a small metal tin that is full of feet and tools. Thanks!