A totally unrealistic question and as Pat mentioned there are owners who own them and are not members. At a nearby city to me, Saskatoon Saskatchewan, one Mark II was in storage for over 20 years and was sold 5 years ago and the last I heard is in Manitoba. The former owner wasn't on this forum either. As for how many of them are even around?? Buddy Holiday's publication from the early 70's guestimated around 1500 and that was 50 years ago. From time to time I see units being parted out and once parted out they are often scrapped. A more realistic question would be how many in VARIOUS STATES OF CONDITION would be more realistic to ask but even that is impossible to guesstimate.
An easier to answer question would be how many two tone are left of the 68 that left the factory. Yes some of them have been wrecked as well and likely less than half of them are still around including mine C56K3391.