Yes Steve, it is! It is one of those Japanese M-System keyboards, this one's by NEC. The split MuTron board is a spin off of that project, just as the one-piece Esrille keyboard.
The Japanese were not hold back by the Qwerty legacy, so for the Latin letters they also use Dvorak (these are '80s/'90s board, no Colemak back then). This looks like some strange "Engrish" take on Dvorak :-) Input of Japanese characters goes by combinations of keystrokes, they have several systems for that, one of them being the "M-System".
Also, the Japanese language does not use the space like we do, so no need for a large space bar.
I am not sure what to think of the midde navigation keys, davkol (forumite here and on Deskthority) says they are comfortable.
I would buy this board in a heart beat (if it had a custom controller, so you could define your own keys). It is ergonomical without being extreme. My mother could type on it (if in Qwerty).
But - no one makes or sells this anymore! My guess is that we have gotten too "stuck" in the Qwerty letter layout (fortunately this forum is working on that :- . And too stuck in the "IBM AT / XT" keyboard layout which now is some standard....
I know of some "mainstream" split keyboards, like the Microsoft Ergo boards and the newer Matias split board. But no one sells a one-piece symmetrical board. I guess it is not commercially attractive? No supply= no demand = no supply, or something like that?