You're entitled to your own opinion, but not your own facts. Delco-Remy made 6V and 12V coils through the 1950's and 60's, and the 12 volt coils were marked as such. All the 12 volt units used either ballast resistors or nichrome resistance wire between the ignition switch and the coil. Ford used a 12V coil that did not need a resistor on some of their applications.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!