Odd stamps : 08 Stamps with special cuts - 03 d

Now to the European continent.
Many countries joined the train of issuing diamond shaped stamps too.
First the Netherlands who issued a special stamp to celebrate New Year

Another small country, but know for its stamps is Monaco.
They issued quit a lot diamond shaped stamps in the 50's and 60's of previous century :

Most of the diamond shaped stamps however I found in Easter European countries:
Hungary :

Bulgaria :

And Romania :