This is still one of the very best Magiro items, and in fact one of the most amazing close-up illusions period. This version was distributed by Howard Schwarzman in 1984, and for all the many versions of Hydro Die, this is often considered the definitive version. What makes this version so effective is because it is so stripped down – unlike later versions by Magic Wagon and Richard Gerlitz – there is nowhere for the die to hide. It just vanishes into thin air! Beautiful effect and getting hard to find these days.
One thing to notice about this version is that it is slightly shorter than the more common gold one. I don’t know if this was produced before or after, but it looks too similar to doubt it is not an original. In magic, inventors often change the items they use based on the available raw materials.