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The 1969 launch of Caliber 6139 was, of course, an important milestone in Seiko’s history because it was one of the world’s first automatic chronographs but its real significance lay in the fact that it incorporated both a column wheel and a vertical clutch, devices that allowed Caliber 6139 to deliver a real improvement in the precision with which elapsed time could be measured in a watch. Today, the vertical clutch and the column wheel are prerequisites in a high grade chronograph; in 1969, this was an important advance in an automatic wristwatch.
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