Zelda is pretty darned cool! And you got a neat bentwood case too.
She's a Singer 15-91 ("potted" motor on the back, gear driven). Takes regular 15x1 needles, short shank presser feet.
If you go to
the ISMACS database, you can date her by her serial number.
Make sure the wiring is good, give her some oil, and have fun with her! (Love mine).