1962 Accutron Astronaut 2 Gen
In reply to I read online that the by Joe124
It is true that the batteries they used back before mercury-based batteries were outlawed were 1.35 volt batteries and now a days the battery voltage for the newer silver oxide is slightly higher at 1.55 volts BUT Accutron 214 movements were designed to safely handle battery voltage as high as 2.10 with no damage to the movement, The higher voltage causes the fork to run with a higher amplitude (the fork tines swing wider) the only thing that is needed in MOST cases is for the indexing to be phased adjusted for the higher voltage...
Anything and everything you could want to know about the Accutron 214 line of watches can be found here...
http://accutronfacts.freeforums.net/