The Tissot 28-1 watch movement, introduced in 1968, likely operates at a frequency of 18,000 vibrations per hour. Notably, its train and hand gears are driven separately by the barrel. This movement features an offset center wheel, along with various functions such as automatic winding, a sweep seconds hand, day and date displays, and a calendar. The date can be set by adjusting the time between 19:20 to 24:00 hours. The Tissot 28-1 movement remained in use from 1968 onwards.