Seiko TMI-VK68

The TMI-VK68 is a quartz mecaquartz chronograph movement manufactured by Seiko in Japan. It combines quartz timekeeping with a mechanical module for chronograph operation, displaying elapsed time across a tri-compax subdial layout. The movement runs at ±20 seconds per month accuracy, uses a 394 or SR936SW battery providing up to three years of life. Notable watches using this caliber include the Brew Metric and Super Metric chronographs.