Howdy,
Its circa was the later 1960s. It was made in Japan and the first time I saw them was in Las Vegas, Nevada.
The public did not accept them and the machines were pulled from the casino's .
All the machines were totally destroyed as the company did not want them to go to Reno or the public.
Value most likely not a lot, since parts and schematics or any information is available. Loose Change Magazine did a article on the Manix and I am sure you could learn a lot on the machine. I do not know the issue.
How ever Loose Change sells on eBay a C.D. with all issues they published . I suggest getting the disc.
I always thought it was a very neat little machine to own. Though I never found one.
Hope this helps you.
Chief