Over the decades there were hundreds of pachinko companies/manufacturers. Some companies either merged together or split apart over the years.
The companies were continuously changing the design of the front of the machine to attract people to play so there are tens of thousands of variations of the front.
Every few years or so, companies would also improve the mechanical design of their pachinko machines mostly noticeable in the back.
Below are pictures of some 1970s pachinko machines with significant mechanical design changes in the back. For pictures of all machines, visit our photo gallery.