Planetary Gear Skeleton Clock - 240 mm Wall / Desk Clock, 12:1 Gear Train for 12888 Quartz Movement

A 240 mm skeleton clock in which the hour hand really is driven through a visible gear train. A standard 12888-type quartz clock movement turns a small copper sun gear on its minute shaft. Three big spoked planet gears roll around it inside a fixed copper ring gear, and the planet carrier turns exactly 12 times slower than the sun. That makes the carrier the clock's hour wheel, so the black hour hand is built into the carrier's front bridge. You watch the three planets orbit the dial once every…

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