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
0673	New Zealand	1953	1965	Ruler Change	Elizabeth II	1	Crown	1953
0674	New Zealand	1967	2000	Coinage Reform		50	Cents	1975
0675	Newfoundland	1865	1900	British Colony	Victoria	1	Cent	1890
0676	Newfoundland	1903	1909	British Colony/Dominion (from 1907)	Edward VII	50	Cents	1909
0677	Newfoundland	1911	1936	British Dominion/Dependency (from 1934)	George V	50	Cents	1911
0678	Newfoundland	1938	1947	Ruler Change	George VI	10	Cents	1946
0679	Nicaragua	1878	1899	Republic		10	Centavos	1887
0680	Nicaragua	1912	1972	Coinage Reform		25	Centavos	1965
0681	Nicaragua	1974	1978	Coinage Reform		5	Centavos	1974
0682	Nicaragua	1980	1985	Coinage Reform		50	Centavos	1983
0683	Nicaragua	1987	1987	Coinage Reform		1	Cordoba	1987
0684	Nicaragua	1994	2000	Coinage Reform		50	Centavos	1997