Hi Carmen ... Canada has produced more than thirty joint issue stamps .... around the world thousands of such stamps exist.
Here is a list of some joint issue stamps ...
https://en.wikipedia.org/wiki/Joint_issue
It's a popular topical (or thematic) collecting area. I know you're on TSF. If you search for the 'Joint Issue' thread you'll send hundreds of examples.
This is the kind of stamp that you really need to go looking for. Even if you see a single joint issue stamp in some kiloware or on an approval card you may not recognize that it's a joint issue stamp. Many of the more modern joint issues are sold together on a souvenir sheet. But many others, especially the older ones, are just sold individually as stamps. If they're on a First Day Cover, that helps.
Here, for example is a joint issue stamp (well, stamps ... as in this case the two countries issued a joined pair of srtamps)
If you found one stamp, or even one pair, in a box would you know they were joint stamps? You've probably seen many joint issue stamps over the years without realizing it. (smile)
Here is a pair on an FDC .... if you collect covers, it is often easier to see the two countries stamps, used, at the same time.
Another example, this time a souvenir sheet.
There are a lot of interesting aspects to this collecting area. For example, sometime joint issues are produced not by two countries but by three ... or more. This is often done in Europe. And, some colonial stamps were issued as Omnibus Issues ... so called because a country, say the United Kingdom, issued the same stamp (only the country name and currency was changed) for all of their colonies at the same time. This was done several times by the UK, by France, by Portugal.
Just one example is this set of stamps issued by the UK to celebrate the end of WW2.
Here's just part of the set.
I had been assembling this particular series stamp-by-stamp for several years. Then, at a club meeting, I found the full set already mounted on Lindner pages in one of Roy's boxes. I bought it and completed the entire set in one go. Happy Day!
Anyway, if you're interested in collecting joint issue stamps ... you might want to start with the list I posted above and then start looking for some of the stamps you want.
And, while Arpin is a good company (I buy lighthouse binders from them) sometimes the best way to find stamps (quickly and without postage) is to talk to some of the club dealers. If you know what you're looking for Roy's 10 cent binders can be a real help.
Have fun!
PS - Sometimes, not always, Scott or Unitrade catalgoues will write, under a stamp's description something like ... "see Germany Sc. XXX". That usually means, it's a joint issue stamp.
