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
0589	Malta	1972	1977	British Commonwealth Realm	Elizabeth II	50	Cents	1972
0590	Malta	1986	1986	Republic		5	Cents	1986
0591	Malta	1991	2000	Coinage Reform		10	Cents	1991
0592	Martinique	1897	1922	French Colony		1	Franc	1922
0593	Mauritania	1973	1999	Islamic Republic		1	Ougiya	1986
0594	Mauritius	1877	1899	British Colony	Victoria	2	Cents	1877
0595	Mauritius	1911	1936	Ruler Change	George V	1	Rupee	1934
0596	Mauritius	1938	1947	Ruler Change	George VI	10	Cents	1947
0597	Mauritius	1949	1952	Coinage Reform		1/4	Rupee	1950
0598	Mauritius	1953	1978	Ruler Change	Elizabeth II	1/4	Rupee	1971
0599	Mauritius	1987	1999	British Commonwealth Realm	Elizabeth II	5	Rupees	1992
0600	Mauritius	1997	2000	Republic		10	Rupees	1997