ETA SA SII-VK83

The SII-VK83 is a quartz mecaquartz chronograph movement developed by Seiko Instruments in Japan. It combines quartz technology for timekeeping with a mechanical module to operate the chronograph function, offering the precision of quartz alongside the tactile feel of a mechanical chronograph. The movement maintains accuracy within ±20 seconds per month and the battery lasts approximately three years under normal use. This hybrid design is notable in the watch industry for blending digital and mechanical approaches within a single caliber.