I have a a working box camera from 1930's. Or it would work, if I could still find film for it at a semi-decent price.

My Sansui 1000X - receiver amp is in daily use and was made in 1971, it's in near mint condition in every way. I did a complete internal cleanup and replaced a few electrolytic capasitors just to be sure to avoid any problems in the future. I believe the unit may well outlive me. I love the silverface-teak cabinet aesthetics. It's paired with a Lenco - L75 turntable from the early 70's and AR-7x speakers from the same decade, together they sound pretty much perfect to my ears.

And I also have my great-aunt's windable table clock. It's ~100-120 years old, but still works if only I remembered to wind it every other day.