I haven't seen one of these before. It is like an early epoch toy. Basically it is a portable pachinko machine (single shot).

Here is the link to the auction: http://cgi.ebay.com/Vintage-Japanese-Mini-Baseball-Pinball-Game-/110696382199?pt=LH_DefaultDomain_0&hash=item19c604bef7

Here is the picture of it.