I found two Singer sewing machines and I need some help with identification and appraisal. I'm hoping someone here can help me. The first one is a feather weight Centennial model. The serial number is AK421688. It is complete and in good working condition, but has no attachments. They want $410 for it. The second one is another Singer and it looks like it needs a good cleaning. It didn't have an identifier on it so I don't know what model it is. The serial number is AE922770. There is a table with this one that is in rough shape. It has a light and a motor. Was that standard? This was only $35. I'm just getting interested in the older machines and need some assistance so I don't get something that I can't do anything with.