If you picked up a hundred chronometrics, how many would be arse-about-face ? half or one percent ? Probably less.
I've only ever seen one original A/C speedo Rik and the bloke who sold it to me said, his Dad bought it NOS, something like 25 years ago and never found a use for it. I've seen at least 3 Enfield's with the front wheel reversed so as to run a conventional speedo. So I now have one original on my WD/G (which had it's wheel reversed when I bought the bike) and one that has been reworked by David Woods to reverse the action on my WD/L.
Anthony as long as you find a chronometric speedo that needs an overhaul, it can be reworked into WD trim by one of the speedo guys.