What does ‘sweep seconds’ mean?

There are two definitions of “sweep seconds”, which mean different things:

In the older days “sweep” second hand referred to a seconds hand that swept across the entire dial, because it was somewhat of a novelty compared to the more conventional (at the time) subdial-seconds.

In newer days, quartz watches came along, which advanced in one-second ticks. And so, many people just started re purposing the term “sweep seconds” to refer to the relatively smooth sweep that was typical of a mechanical watch that advances more than once per second.

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