Have a buddy has a 71 750 since new, it has about 160 on it,cases never opened.. it had 68k on it at the end of 73. It got an 812 kit and cam at around 80 or 90 K, he did the rings a couple times but never opened the cases.
His brother has a 72 750 with well over 100K on it too.
My 73 750 had 5 or 6 K i think when I bought it, I turned over 60 K on that speedo, but I think it may have only been 40 something K on that 73, not sure anymore, it might be the one that I took out a rod in.. 350 miles from home.. rode it back, took out a journal..
Turple Bros Honda in Red Deer Alberta has a 69 with around a 100 K on it..
A member on here has around 120 K on an F 750