The oldest piece of technology you still use

What is the oldest piece of technology you still use frequently? Not something that’s chillin dead in a drawer somewhere?

Aside Master System (got it 1990) that I dig out annually and oldest computer (1994) that gets some use couple times a year, the second oldest PC (1998) is the one really in regular use.

Living room lamp may actually be bit older than any of these.

I have an AM only, 9 volt, radio that proclaims it has TRANSISTORS in it, that could very well be from the late fifties or early sixties, that still works.

I check it a couple of times a year with a fresh battery and keep it in the emergency kit.

A Vintage Gingerbread Mantle Clock that's been passed down from my Grandfather's father.