Classic Nintendo arcade cabinet for 'Monkey Magic' surfaces

Why is this such a big deal? Turns out arcade game collectors had no idea if the Monkey Magic arcade unit actually made it into production. There was a picture of one unit, but no one knew if that was actually at an arcade or just a prototype cabinet. Now a Yahoo! auction has popped up for this cabinet, making it the first time one has surfaced. This is going to be one hell of a collector's item for Nintendo fans.