jye if u d/c the choke wire the choke will be on all the time
thats if it still works
alot of them jam up over the years and just stay off all the time
as chris said it may have 12v or 6v stamped into the coil housing
but most aftermarket coils which urs looks like have them on stickers or painted on which on a old weathered coil like that is pretty hard to find
thats still an old 6 volt reg and genny so i would say most of the car is still 6 volt