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
0829	Spain	1940	1953	Nationalist Government		5	Centimos	1941
0830	Spain	1948	1975	Regency	Francisco Franco	100	Pesetas	1966
0831	Spain	1976	1992	Monarchy	Juan Carlos I	5	Pesetas	1983
0832	Spain	1989	2000	Coinage Reform		100	Pesetas	1999
0833	Ceylon	1870	1901	British Colony	Victoria	1/4	Cent	1901
0834	Ceylon	1902	1910	Ruler Change	Edward VII	10	Cents	1903
0835	Ceylon	1911	1929	Ruler Change	George V	50	Cents	1924
0836	Ceylon	1937	1951	Ruler Change	George VI	25	Cents	1943
0837	Ceylon	1955	1957	Ruler Change	Elizabeth II	2	Cents	1955
0838	Ceylon	1963	1971	Coinage Reform		1	Rupee	1963
0839	Sri Lanka	1972	1994	Republic		5	Rupees	1976
0840	Sri Lanka	1978	2000	Dem Socialist Republic		5	Rupees	1986