Is that the one that was listed at $450 in Puyallup?
That vintage of machine was designed to use the left flipper button to turn on the machine. If credits are on the credit unit, then simply pushing the start button will light up the machine and start a game.
Playfield looks to be in excellent shape to me. This is a fun game.
The original backdoor key was a single bit Fort Lock # 288 as the machine was shipped from the factory.