Anyone remember the "Elcassette"?

Somewhere in the middle '70's, Sony brought out a tape deck
called the Elcassette. It used 1/4" (?) tape in a large cassette, something similar to the "Beta" cassette.

This system was rather highly thought of, at the time.

I had two of them back then. Still have one and a full case of unopened cassettes.

Any market for these?

TIA, Barrie