Seiko 7T92 chronograph
Equally well known is the Seiko 7T92 chronograph movement. If you don't require the alarm function but would like a more precised stop watch 1/20th of a second. The Seiko 7T92 movement had the subdial located at 12 o'clock and had a 1/20th of a second indicator. The subdial at 6 o'clock has hour and minute hands that track the chronograph elapsed time up to 12 hours. The hands all tick once per second like normal chronograph watches, except the 1/20 second hand as it spins like a whirling dervice. Seeing it spin crazily is cool, however you can pretty much feel the battery power draining away.