One From Every Country
(or more correctly, one from every sub-entity!)
An example for each of the 1048 (of 1086) coinage types in my definitive 20th Century OFEC Collection
Note that they are in the same order as on the "20th Century OFEC Entities" page.
(I am in the process of adding images of each coin, please bear with me; in the meantime - get in touch!)

#	Sub-Entity Name	coins from	coins to	Political Designation	ruling authority	Den.	Unit	A.D. Year
0889	Trinidad and Tobago	1976	2000	Republic		10	Cents	1990
0890	Tunisia	1891	1902	French Protectorate	Ali III	5	Centimes	1892
0891	Tunisia	1903	1906	Ruler Change	Muhammad IV	10	Centimes	1904
0892	Tunisia	1907	1921	Ruler Change	Muhammad V	10	Centimes	1916
0893	Tunisia	1918	1920	Coinage Reform		10	Centimes	1919
0894	Tunisia	1921	1945	Coinage Reform		2	Francs	1941
0895	Tunisia	1926	1926	Ruler Change	Muhammad VI	10	Centimes	1926
0896	Tunisia	1930	1942	Ruler Change	Ahmad II	5	Centimes	1938
0897	Tunisia	1945	1946	Ruler Change	Muhammad VIII	5	Francs	1946
0898	Tunisia	1950	1957	French Community Associated State	Muhammad VIII	20	Francs	1950
0899	Tunisia	1960	2000	Republic		5	Millim	1997
0900	Ottoman Empire	1876	1912	Empire	Abdul Hamid II	5	Kurus	1909