Very nice machine and cases Cathy! I don't know the specifics but didn't some of the early 15s take a different bobbin case than most? No such thing as too early. It just means you have one of the earliest gaps in your collection of 15s filled now and I love the decals on that one.
The cases should be perfect for your plans. I just wonder how someone ends up with that many cases and no silverware in them.
Rodney