Youre right and thats an interesting poster, I wonder how it would looks like if you add the landmass of the other countries colonies
In case anyone is interested in guessing--the roman numeral VIIII is the denomination. Or feel free to move on and post something new, anyone.
I would have guessed an old german 9 Pfennig piece like this one: https://en.numista.com/catalogue/pieces106168.html
Sadly no, you have to looks more south Little hint: The issuing country is located at the mediterranean sea.
Turkey 1 Kuruş 1938-1944? (If you search all Numista for coins with scalloped edges there's only 9 pages of results. Turkey's on the last page, though, so I thought I was going to strike out.)