Yes, I know, they all have a "patent" date on them.
But what about the ones that just say "patent" with no year?
The earliest one of which I can find a pic says "patent 71"
But aluminum Nuovo Record rears were introduced in '67, according to multiple campy timelines on-line.
So how do you date an NR derailleur that just says "patent" with no date?
Duncan Granger
Lancaster, PA