Evening
As a side project to my Charlton pence and 15c variant work, I've also been capturing examples of the Canadian Price Variants for Charlton. I've populated the usual summary chart - it looks like this:
...and here is what I have discovered so far:
The earliest CPV cover date I have found is September 1983
The latest is July 1984
From August/September 1984 (all titles are bi-monthly, staggered by the way), 8 of the still running 11 title's issues