Whats your oldest personal possession

A family piece, a Dufa wall clock from the 20’s. They were in business from 1919 until WWII when the Nazis forced the plant to move from clocks to making clockworks for weapons guidance, so exact details are scarce. I restored it and it will lose a couple of minutes every few months. I need to lube the works again.

I have a spark plug tester from Champion that far as I can tell it’s from 1915. Not only does it work, it’s Model T vibrating coil will make 37kv.

Finally, a 6-12-24V battery charger with a patent date of 1917.