1940s vintage recipe card holder file box, shelf of little metal 'cookbooks'

I love this cute vintage 'cook book shelf' of little metal 'books' to hold recipe cards. I've never seen a recipe box quite like this before.

This painted finish is all original with the original decals, slightly worn and yellowed. There's a few rust spots, it's pretty clean overall. Sized to hold recipe cards up to 5" or a little less, it's empty now.