I have some railroad stock certificates from the late 19th century that I need to frame. They're a few bucks on ebay and really freaking cool
In terms of electronics, I have some model trains from the 60s and 70s that are pretty worthless but keep going despite the abuse and lack of maintenance thanks to electric motors being so simple and easy to maintain. Other than that it's probably a shoe in between my wife's N64, PS2 and CRT TV, an old police scanner I got off ebay, or the early plasma TV that I got from my parents who got it from my aunt who got it with their house.