I think it was more common with the Brits. Everybody would know about it but many of the Plymouth and Dodge cars had Positive ground. I had to change the polarity on my 1950 Plymouth Special Delux because I couldn't get the right battery or some reason. I forget what you did to the Generator but the polarity on the coil had to be changed.
I think there were others but I remember the Plymouth because it was one of my best cars of all time. It was wrecked by a housemate of mine who took it one night because he was drunk. The car had a broken steering box and would only steer to the right. He didn't know about this and drove it into a sugar cane field. My friends pulled it out and took it to the junk yard so I wouldn't have to see it. Boy what good friends those were don't you think?