About 10 years ago I started keeping records of 6.9s that I'd seen on the road, or ones that had been advertised in the printed media. I stopped doing this religiously a while ago, due to the decline of printed media & the rate at which ads on the net were being utilized (there's too many ads on the net to monitor regularly).
I know that the M100 site appears to keep records of ones that are still alive, but I'm not a member (yet). Does anyone have an idea of how many of these cars are...