Just picked up a prototype Firepower, number 56. It's my only pinball so I guess I collect only proto's I didn't know it was when I bought it but soon noticed the factory cut out for drop target switches and all the wiring and switches were intact. It also has a backglass without the mirroring and a few different colours than the one everyone knows. Few other oddities such as two different sized flipper buttons and probably things I haven't noticed yet.

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