I'm not sure - the Belvision series, I think, was released by Sony in the 1960s in the US. They were in cardboard sleeves, and I'm assuming in NTSC format.
Which series did
The Black Island you saw belong to ? These are two screenshots, one from the 1960s Belvision, and one from the 1990s Ellipse-Nelvana series :
Belvision
Ellipse-Nelvana
The Ellipse-Nelvana series is generally very faithful to the original material, and is the one that is currently available on the Universal DVD label. It's also that series that the two videos were available from that I mentioned in my earlier post ; I'm not sure how many of the Belvision series was released, but I've seen most of them at some point or other on eBay or Amazon zShops (except
The Calculus Affair / Case).