Sorry Viking, I have no examples with images, just a list
(Mette's were images, still searching)
The list is from 2005, days of the wild west in computer terms
Our newsgroup was very active RCSD
and we were swapping images in our journey into Philately.
The Author : Is / was JS deboo
That's all I have
The Austrian Don Quixote, was a masterpiece by "Rein"
I really regret losing that one
Here, an example (if there is any interest for you)
For the record, Canada has hidden year dates on her stamps.