men's watches with advanced GPS and fitness tracking features -Seiko Prospex Speedtimer Men's 41.4mm Stainess Steel Solar Chronograph Watch SSC913P

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The 1969 introduction of the Seiko Speedtimer was an important milestone in the history of the chronograph. It was one of the world’s first automatic chronographs and featured Calibre 6139, whose precision in elapsed time measurement signified a real advance in the history of the automatic wristwatch. Today, the newest generation of Seiko's Speedtimer chronographs embodies the spirit of the original series but offer the added convenience, reliability and accuracy of Seiko’s solar technology.