Quote:
I did read that there have been error types that have only been found in year sets.
Here's one example off the top of my head - this Petro-Canada stamp exists with two different forms of die-cutting. The rare one was only available in the year-end collection and the quarterly releases pack. On the rare version, the die-cutting was done upside down, so there are two peaks upward on the top instead of one. Note that the Canadian Postal Archives site shows the rare copy!
http://data4.collectionscanada.ca/n...=POST&p=1&u=http://www.collectionscanada.ca/archivianet/020117/
020117030419_e.html&r=1&f=G&SECT3=POST
Ryan
