In September 1918 Australia Post minted four stamps about motorcycles. The motorcycles are described thus:
$1 1904 Kelecom
James Hill & Sons of 63 Grenfell Street, Adelaide, assembled cycles using Kelecom engines from 1902 to 1904, most of which were sold with the Kelecom name on the tank. The engine was named after Belgian engineer, Paul Kelecom. The 1902 machines used 1¾ or 2¼ hp engines in a BSA bicycle frame set, with the engine mounted on the seat tube. In mid-1903, the engine was mounted in the now conventional position in front of the pedal bracket, with choice of 1¾, 2 ¼, 2 ¾ or 3¼ hp engines. The motorcycle on the stamp dates from 1904.
$1 1912 The Precision
Precision engines were manufactured in Birmingham, United Kingdom and exported all over the world. Several Australian firms used Precision engines in their motorcycles, including AG Healing of 354 Little Bourke Street in Melbourne and Adelaide companies Lewis & Bullock and James Hill & Sons. The range of Precision engines included the 2¼ hp two-stroke up to 8 hp V-twin, in frames of their own construction. Most cycles were equipped with the 4¼ hp "Big Four" single-cylinder engine which was widely marketed from 1912 as the Precision Big Four motorcycle. The example on the stamp was originally assembled with a 500cc air-cooled side-valve "Big Four" single-cylinder Precision engine in 1912.
$1 1919 Whiting V4
The Whiting V4 motorcycle was conceived in Melbourne in 1912 when engineer Saville Whiting designed and built an innovative spring-frame cycle with semi-elliptic leaf sprinting on both the front and rear wheels. In 1914 Whiting took his design to England, where he became a partner in a London engineering firm, intending to market his design. In London, Whiting designed an air-cooled V4 engine for the motorcycle. The prototype was built and installed in the original frame and bought back to Australia in 1920.
(More on the Whiting)
$1 1923 Invincible J.A.P. The Invincible J.A.P. is perhaps the best known of pre-World War II Australian-constructed motorcycles. Constructed mainly of British parts, the Invincible J.A.P was built in Melbourne for Turner Bros of Swanston Street by Firth Bros., Richmond. Firth Bros started constructing the Invincible J.A.P. in 1922 when, after losing its Harley Davidson agency, it needed a large motorcycle to compete with American models. For the next five or six years the Invincible J.A.P. sold all over the country to a strongly patriotic marketing campaign that included "It's all British, built in Australia by Australians!" The Invincible J.A.P. was constructed from a J.A.P. (J.A. Prestwich Industries) engine, a Burman gearbox, Messenger No. 1 saddle, Australian Excelsior/Henderson copy forks and Edwards Brothers saddle tanks. The cycle on the stamp is a standard 6hp 770cc Invincible J.A.P. dating from 1923.