A collection of postage stamps issued in celebration of Olympic Games, i) eleven 1896 Greek issues for 1st Modern Olympiad, four unused 1, 20, 40 & 60

A collection of postage stamps issued in celebration of Olympic Games, i) eleven 1896 Greek issues for 1st Modern Olympiad, four unused 1, 20, 40 & 60, the remainder postmarked 1, 2, 5, 10, 20, 25 & 40; ii) seven 1906 Greek issues for the Intercalated Games of 1906, unused 1, 3 & 20, used 2, 5, 10 & 25 iii) three 1920 Belgian issues for the Antwerp Games, all unused and overprinted 20c on original values of 5c, 10c & 15c iv) eight 1924 French issues for the Paris Games, an unused and a used example for 10, 25, 30 & 50 not illustrated