Because the hour hand, minute hand and second hand gear shaft are concentric. The structure has the least loss and the lowest friction is the fastest in the heart and slowest in the outer heart.
The three gears are fixed in different ways. One end of the second hand is directly on the deck, while the other end is fixed by a bearing made up of minute hand and hour hand. The hour hand and minute hand are fixed almost by the axis of the second hand.
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