Early Ball & Balls Extra Early

[dokutaaguriin]

I received an email the other from a gentlemen enquiring about these two varieties. He says that some 60 years ago his mother only grew out a variety called Early Ball. When the seeds for that variety dried up some 30 years ago his mother purchased the plants for Balls Extra Early. He thinks that Early Ball is not a hybrid but suspects Balls Extra Early is.

Does anyone know anything about these two varieties? And,
is possible to get seeds?

Jeff