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Seiko 5 SYMA40 SYMA40K1 SYMA40K Automatic Women's Watch The 4207 mechanism is specially designed to fit into petite ladies' watches. Using a ball-bearing, quarter-arc rotor, its tiny mainspring allows manual winding beside what the oscillating rotor delivers. This comes handy in keeping the mainspring charged all the time. It, however; doesn’t hack, so perfect synchronization to any particular time source will take longer. You can wear it every day and almost everywhere!

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