On the contrary @bluefury361 I had a quartz movement conversion done on the one in my silver ‘67 and it’s sweep is fluid and silent.the problem with a quartz conversion is the sweep of the indicator is a noticeable 1 second increment. Sometimes noisy too. The original clock had a smooth uninterrupted sweep.
It's kind of an issue for us purest. But they do function well if that's not a problem.
There are folks who will rebuild your original, sometimes just a good clean and lube is all that's needed.
So that’s what this thing is! I had no idea. It’s been sitting in the “What the hell is it” bin since it came to me.