Well, the specs from
here match up with tactile Cherry
MX switches- 20 million keystrokes, 4mm travel, 65 gram (2oz) keyforce, as well as "fast input key support for three different types of angles on stage." (from
here) which
sounds like the angled keycaps that Cherry supplies for different rows. "mechanical key characteristic lilting sound of typing. Comfortable keystrokes can enjoy." sounds like Cherry blues, to me. (Maybe.)
And it claims 6-key rollover in USB use, or 11-key with the PS/2 adapter.
Here's Sanwa's page for it. (For some reason, Google translation doesn't work on it- Babelfish does, though)