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
0601	Mexico	1870	1909	Federal Republic		10	Centavos	1901
0602	Mexico	1905	1949	United States		5	Pesos	1948
0603	Mexico	1950	1970	Coinage Reform		25	Pesos	1968
0604	Mexico	1970	1984	Coinage Reform		100	Pesos	1978
0605	Mexico	1984	1992	Coinage Reform		500	Pesos	1987
0606	Mexico	1992	2000	Coinage Reform		10	Peso	1997
0607	Moldova	1992	2000	Republic		50	Bani	1993
0608	Monaco	1891	1904	Principality	Albert I
0609	Monaco	1924	1926	Ruler Change	Louis II	50	Centimes	1924
0610	Monaco	1943	1947	Coinage Reform		1	Franc	1943
0611	Monaco	1950	1956	Ruler Change	Rainier III	10	Francs	1951
0612	Monaco	1960	2000	Coinage Reform		5	Francs	1960