"David Nebenzahl" wrote in message
s.com...

My Magic Chef, which I got used, lessee, 23 years ago
or so and still works perfectly, has a very accurate clock.
Crystal-controlled, I'm going to guess.

In the US, line frequency used to be (and probably still is) "tweaked" so
that clocks with synchronous motors would have zero net error over a long
period of time. This should give better accuracy than a crystal.