The Omega caliber 1310 Megaquartz 32 Khz was introduced in 1973. It was Omega’s first in-house quartz movement, and was produced until about 1978. It has 8 jewels and a frequency of 32,768Hz. The caliber 1310 later evolved into the caliber 1315.
Watches with this caliber have two buttons on the right side of the case – above and below the crown. One button advances the calendar date, the other button hacks the second hand for precise time setting.