Pachinko Machines are valued by a few factors, the most important being condition. Another factor is age. 60s and 70s machines, although great vintage items, are cheaper than newer models from the 80s because they lack expensive electronic components. A 60s/70s machine is worth $25-$100 depending on condition. As a side note, Nishijin was a major producer of pachinko machines, so it's not really a 'rare' item, although it is still a good collector's item.