You can study that difference for yourself here, in a link JohnnyC provided in FJFJFJ's retro battery thread, which providentially depicts both a 1961 and a 1962 for comparison: http://www.serie4.fr/articles/pdf/20100309104700.pdf
Thanks for the link, but I already knew the difference in the early bumpers
I was just saying that the the general population at large would have no idea that there was a difference

