With no system of civil aircraft registration in Australia at the time, this Pup initially flew on in RAF marks and with its RAF serial. In 1921, it was added to the new register as G-AUCK and operated by Geelong Air Service. When G-AU was replaced by VH-, the Pup became VH-UCK. It was finally cancelled from the register in 1945 by which time it had been fitted a Genet radial engine. CD Pratt photo