Originally Posted by redpurselady
That bobbin is for a vibrating shuttle machine. I have a Singer 27 (1906) treadle and a Singer 128 (1947) that uses them.
By the way - Trixie is just beautiful! Enjoy your new toy!
Yep thats what it is a shuttle bobbin.
Trixie is very pretty, you'll just love having her once you get started with her.