What's the oldest piece of tech you still have running?

Best I have is an old Midland Gun Company double barrel shotgun that belonged to my great-grandfather. Passed through the Birmingham Proof House and bears 1904-1925 proof marks, but doesn’t actually have a date stamp, my understanding is that they didn’t start date stamping until 1921. The company was bought by Parker-Hale and the records were subsequently destroyed in a fire, so I’ve never been able to find out exactly how old the thing is.