Here is my Betty. Singer 221-1 Featherweight, AE975504. Which from what I can find, means she was born 5/24/1938.
I was blessed to have her gifted to me from a friend from yoga class, it was one of her grandparents', she couldn't remember which... I couldn't be more grateful, I am still STUNNED that she is mine!! She (the friend) said she just wanted the machine to go to someone who would love it, and use it...and I said, YEP! THAT'S ME!
When I got her, she was in great shape, but definitely "attic fresh" and had a tension problem- she needed some good cleaning, re-oiled and lubed, some TLC to the bobbin and top tension discs...now she's purring like a kitten and in great working order! And the case is in great shape, and seems to be complete. I am just SO in love with this machine.