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
0733	Poland	1957	1990	Peoples Republic		500	Zlotych	1989
0734	Poland	1990	1994	Third Republic		50	Zlotych	1990
0735	Poland	1990	2000	Coinage Reform		1	Zloty	1991
0736	Portugal	1890	1908	Monarchy	Carlos I	100	Reis	1900
0737	Portugal	1908	1910	Ruler Change	Manuel II	200	Reis	1909
0738	Portugal	1912	1916	First Republic		10	Centavos	1915
0739	Portugal	1917	1940	Coinage Reform		20	Centavos	1924
0740	Portugal	1927	1968	Second Republic		20	Centavos	1963
0741	Portugal	1963	1986	Coinage Reform		20	Escudos	1966
0742	Portugal	1982	1982	Third Republic		5	Escudos	1982
0743	Portugal	1986	2000	Coinage Reform		5	Escudos	1986
0744	Qatar	1973	1998	Ruler Change	Khalifa bin Hamad Al Thani	5	Dirhems	1978