Seiko 6139 General Export models
In the spring of 1969 Seiko introduced the 5 Sports Speed Timer to the Japanese domestic market. It was the world’s first self-winding chronograph. The revolutionary 6139A automatic movement featured a vertical clutch system and a column wheel. A few years later, in November 1973, the Seiko Speed Timer also became the first automatic chronograph to travel into space, worn by Colonel William Reid Pogue during the NASA Skylab 4 …