Rolling Ball

What is the name of the watch with only a small rolling ball for an hour hand on the face?

I have been looking for it *forever*. I saw it advertised in the back of a major magazine, and was only sold on a few websites. Anyone know what it is? You could order it with your choice of colors. Usually was just black face with a little metal looking ball that slowly rolled in a circle for the hour hand all day.

Erich Lacher’s ABACUS

Cool Watch!

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8 DAY Fusee Chain Congreve Rolling Ball Clock with BELL STRIKING
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