Africa had a nice contribution when it comes to triangular stamps (see before), but how about diamond shapes? Well also here, the ebony continent has a lot to offer for collectors of odd stamps.
Far from complete, but a nice teaser from all over Africa.
First stop is in the North, Egypt :<
U.A.R. : United Arab Republic
same style of stamps :
two former colonies of Belgium : Congo Demotratic Republic and Burundi