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Definitely the Moog. I'm not into music, but it's an unlimited source of electricity; just open the case and find the power rails.
Good luck opening it without a screwdriver.
There's a good book from a former Smithsonian curator called One Good turn that talks about the ancient history of the screwdriver and the screw.
If you went back in time far enough that the people around you didn't know about the screwdriver and the screw, Even a rudimentary knowledge of It's existence would possibly on its own break the timeline.
I could easily reinvent the screwdriver. What i could use the electricity for however...
They had hand drills back then. Just drill out the screws.
Or just sketch what you want and have a metalworker of the period make it. They would have had the precision to manage it particularly if you sacrificed quality and worked in pewter. Pewter is so easy to cast you can pretty much diy.
The Phillips head screwdriver screws are great for not exactly needing the most precise shape for undoing them. Anything sort of in the ball park will work.
Hell, just press a bit of wax into the screw head for an impression, then use lost wax casting to cast a driver.