Thank you very much for this - and bought !!
I currently have a WTB for one of these. The price was a bit on the high side, but these are not easy to find, there are no recent sales to use as a comparision and this was a particularly nice example, so seems silly to miss it for the sake of a few quid.
The 1982 CWC is also nice, but I already have one of those, but again his price is not steep when you look at the prices being asked on e-bay and Chrono24. The CWC is by far the easier of the two to track down.
Just need to find something from 1981 now - that really is a challenge.
Anyway, very much appreciated,
Ken