It's generally accepted as the first, but Allied Leisure Rock On is also a contender (released in September, 1975). There wasn't a release date available for Spirit of 76 other than the year, so it's unclear if Rock On or Spirit of 76 was released first.

http://www.ipdb.org/machine.cgi?id=4862

http://www.ipdb.org/machine.cgi?id=2294

Looks like someone replaced the original shooter assembly with a williams assembly.

And a chunk was cut out of the leg to accommodate it

Viza War is the same way...that came out a year later (1976).

It uses coils with only a single winding. The high and hold/low voltages are controlled by logic on the MPU.

20160820201509806 (resized).jpg

Aw, that's disappointing. I saw the bally coil, but didn't realize the whole assembly was swapped out. I wonder if the original parts were kept in a box somewhere with the game.

I'm not surprised. Once the newness factor wore off, there wasn't a whole lot about those games that could hold a player's attention. Despite the the huge industry shift those first SS games started and the interesting SS platforms they were built on, the games themselves were one trick ponies, unfortunately.

No, he was saying Allied Leisure used their own mechs on their games, like Mirco Games did on Spirit of 76.

Here are the original flipper assemblies for Spirit of 76:

http://www.ipdb.org/showpic.pl?id=2294&picno=55717&zoom=1

image-35[1] (resized).jpg