incoming2me

Could someone please help me identify this Singer machine?
I was thinking about getting Great-Grandmother's treadle out and back into use. I called my mom, who has had the machine stored for over 30 years, to drag it out and send me a picture. I've not personally laid eyes on it in over 30 years!

I'm thinking it's a 15-30?
Hopefully it's a bobbin machine, not a shuttle.

Thanks!