This reminds me of when the euro came out, since every country in the euro zone had it's set of coins (well, on one side), so that's 8 coins for 13 countries that people started collecting.
After a few years people stopped keeping them and there's a bit more mixing,
yet there's a few I think I've never seen, and being in a capital I'm probably in a good position to see a mix of them.
For 13 coins (in my purse) I have 2 'foreign' ones, Germany and Portugal; which are the most prevalent ones with Spain, Belgium and Ireland.
The hardest to have are the really small ones, 1,2,5 and 10c.