c. 1929 designed by G. Pitt-Morrison, engraving by Frank D. Manley "This stamp was released to commemorate the 100th Anniversary of the founding of Western Australia, the design incorporates a Swan as the central figure, with Kangaroo Paws (W. A. State Flower) & Eucalyptus flowers & leaves, an Official stamp punctured OS was also issued for Government use." —text via Australian Stamp Catalogue
