Pre Stamped Envelope – Australia – Sydpex 80

Australia issued a 22c Pre stamped Envelope on 29 Sep 1980 to commemorate Sydpex 80 Philatelic Exhibition. The Envelope shows the illustrations of First three Stamps issued by New South Wales in 1860 and it also shows the Sydney Post Office Building in 1850. It is  Pre Stamped Envelope no 029.