The Seiko 5P31-7009 is a mechanical movement with the following functions: winding stem at 3 o'clock, hacking seconds, sweep seconds, manual winding, non-automatic, 8.75 ligne size, 17 jewels, 18,000 vph (vibrations per hour), 40-hour power reserve, bidirectional winding, bidirectional automatic winding, and date indicator at 3 o'clock position.