5 Different 1976 Internation Society of Postmasters Silver Medallic First Day Covers in Original Env

Group of 5, all different, of these International Society of Postmasters Silver Medallic First Day Covers from 1976. Each medal is 20g of Sterling Silver, and each one is housed in it's original shipping envelope. Includes medals commemorating the following events: the Babenberg Exhibition, the 10th Anniversary of Botswana Independence, the inauguration of the Japan-China Cable, the Royal National Eisteddfod in Wales, and Australia's 75th Anniversary of Nationhood.