First day cover (SA)

Collection of 18 South African First day Covers:
22 Blue Train with postmark 1972 23 SPCA 100 years 1972 24 ESCOM 1973 25 RSA Open International Games 1973 26 UNISA 100 years 1973 27 Woltemade 1973 28 Hockey 1973 29 Green Heritage 1973 30 CJ Langenhoven 1973 31 Kimberlite Conference 1973 32 World Telecommunication Day 1973 33 Tulbagh 1974 34 Numismatic convention 1974 35 Malan - Riebeek-Wes 1974 36 World Sugar Congress Durban 1974 37 50 year broadcasting 1974 38 1820 Monument Grahamstown 1974 39 100 year postal union 1974