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Grand Seiko's first mechanical complication combines a constant-force mechanism and a tourbillon as one unit on a single axis. | Grand Seiko
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Grand Seiko's first mechanical complication combines a constant-force mechanism and a tourbillon as one unit on a single axis. | Grand Seiko
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Grand Seiko's first mechanical complication combines a constant-force mechanism and a tourbillon as one unit on a single axis. | Grand Seiko
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Grand Seiko's first mechanical complication combines a constant-force mechanism and a tourbillon as one unit on a single axis. | Grand Seiko
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