Omega caliber 1620
|Hands:||Hours, Minutes, Small Seconds|
Omega caliber 1620 is quartz movement used in the Speedmaster Quartz. Advanced for its day, it featured a full calendar, and a split seconds chronograph. It is powered by two batteries (SSIH 9909 / Vartachron 547).
A special version with a screen backlit by tritium strips was used in the Speedmaster Alaska IV prototype watches.