And once the Omega Speedmaster landed on the moon back in July, 1969, it was forever known as the Moonwatch.
Most modern watches have a beat rate of 28,800 bph (beats per hour). Among other reasons, this means that you get a nice smooth sweep motion of the second hand around the dial. The Speedmaster Professional has a beat rate of 21,000 bph which makes for a slightly jerky, staccato motion of the second hand, but it's barely noticeable, except to the trained eye.
The Speedmaster shown above with a hand-wound pocket watch from around 1914. Here's a view of the pocket watch movement;
But then, I have known some folks who regularly wear this watch when fishing or swimming. Me? I prefer to err on the side of caution.
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