The SpeedSonic has no handwound, automatic or quartz movement, but a tuning fork movement.
Like the Bulova Accutron had in the 60s. The movement in the Omega Speedmaster was also
developed and produced by Bulova. The movement ticks on a very high frequency by using the
vibrations (360 hz in the first Bulova Accutron (cal.214, 1960)) of the tuning fork.
Tuning forked watches are more accurate than a handwound or automatic watch. The
movement is powered by a 1.35 volt battery (not 1.5v like the current quartz watches, so
beware!). When the Quartz watches turned up, Omega stopped producing these watches. So
they were not very long in production. This makes these watches quite rare, and thus
collectable. Omega managed to use this kind of movement in several of it's lines
(Constellation, Seamaster, SpeedSonic).
In 1973 Omega launched a SpeedSonic which had a frequency of 300hz and it
used the cal.1250/1255 movement from Omega/Bulova. Please check the following link to read
all about these watches.
Also read the book called "Watch - history of the modern watch" by Pieter
Doensen. ISBN nr : 90-5349-135-X.