by nvmos2 » Wed Nov 18, 2020 12:11 pm
How does this theory sound:
Not a Prototype, but a revamp.
The top casting looks like an Operator Bell Bullsye, c 1927, near the end of the line for slots without jackpots.
Mills introduced the Skyscraper c1932.
When many of the older machines without JPs were being revamped, Mills was known to revamp their own machines.
Perhaps they revamped one of their Bullseye machines with a modified Skyscraper casting to add the JP front.