Sadly, not much, though there are many countries that have used the gold standard in the past. Depending on what country you are in, it still might be very possible. One thing I have found is that if the country you are in Europe has went to the Euro and no longer trades it's old currency, most likely you won't find anything silver (I could be wrong here but if im not mistaken the euro is fairly new and never had any precious metal coins.

Here is a thread about CRH in switzerland, apparently they have some.
http://en.numista.com/forum/topic19926.html

I know Germany had some back in WW2 but I'm pretty sure they are far from being circulated anymore (actually, positive haha). I'm not sure of other nations. Ones that come to mind are like Spain and Greece Morroco, but more than likely since a Spain and Greece use the Euro instead of their old currencies it will make it near impossible to find the old rare coins.

I'd check any of the countries that still utilize their own currency, whether it be beside the euro or not :) 

Sorry I'm not much more of a help though, I'll dig around for you and see what I can find.