I have one of those sticks as well, and it is definitely a Wico.
Mine doesn't have Data East stamped on the top though.
Also, thanks for answering my unasked question as to wether or not these work with the Druin interface.
In my opinion this would be the superior of the two mechanical rotarys. The smooth top is more natural for non-rotary games, and the leaf switch action feels nicer.
Another (nearly unknown) Wico stick is the one I call the "microleaf", which uses the leaf switch base, handle, and bushing, but has microswitches and a square actuator instead. The feel of a Wico, combined with the precise clicky action that the fighter nuts love.