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
0985	Yugoslavia, Federal Republic of	1993	1993	Coinage Reform		2	Dinara	1993
0986	Yugoslavia, Federal Republic of	1994	1994	Coinage Reform		1	Dinar	1994
0987	Yugoslavia, Federal Republic of	1994	1999	Coinage Reform		1	Novi Dinar	1996
0988	Yugoslavia, Federal Republic of	2000	2000	Coinage Reform		5	Dinara	2000
0989	Zambia	1964	1964	Republic		6	Pence	1964
0990	Zambia	1966	1966	Coinage Reform		1	Penny	1966
0991	Zambia	1968	1989	Coinage Reform		10	Ngwee	1968
0992	Zambia	1992	1992	Coinage Reform		1	Kwacha	1992
0993	Zanzibar	1882	1886	British Protectorate	Hamud bin Muhammed	1	Pysa	1882
0994	Zanzibar	1908	1908	Ruler Change	Ali bin Hamud	1	Cent	1908
0995	Southern Rhodesia	1932	1936	British Self Governing Colony	George V	1/2	Crown	1934
0996	Southern Rhodesia	1937	1952	Ruler Change	George VI	1/2	Crown	1942