You may get info at the vintage machine shop:
Welcome to the Quilting Board!
Someone on another thread (will post a link if I can find it again) posted that Singer at times would make machines that were "blank" -- no Singer logo on them -- so companies could put their own logos on them.
This one looks like a "blank" Spartan that has been decorated and named Cinderella!
Edit: Ok, found the post. Scroll down to BARBM32. They were Singer knockoffs.
Thank you for the tip on my Cinderella machine. I thought it might be a singer. No serial number so not sure what year it was made. Looks great in my sewing room.
What a pretty machine. When I have questions about sewing machine; I also called one of the three quilts shops here in town. I will ask around. Good Luck.
Sorry I can't help but it sure is a gem. I haven't seen one
like it before.