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
0481	Jamaica	1964	1969	British Commonwealth Realm	Elizabeth II	1	Penny	1964
0482	Jamaica	1969	2000	Coinage Reform		50	Cents	1977
0483	Japan	1873	1912	Empire	Meiji	10	Sen	1907
0484	Japan	1912	1926	Ruler Change	Taishō	10	Sen	1920
0485	Japan	1926	1940	Ruler Change	Shōwa	1	Sen	1935
0486	Japan	1940	1948	Coinage Reform		1	Sen	1942
0487	Japan	1948	1989	Coinage Reform		1000	Yen	1964
0488	Japan	1989	2000	Ruler Change	Heisei	10	Yen	1991
0489	Jersey	1877	1894	British Crown Dependency	Victoria	1/12	Shilling	1877
0490	Jersey	1909	1909	Ruler Change	Edward VII	1/24	Shilling	1909
0491	Jersey	1911	1923	Ruler Change	George V	1/12	Shilling	1911
0492	Jersey	1923	1926	Coinage Reform		1/24	Shilling	1923