As a side note, an entire new stamp issue of engraved values was envisaged (to replace the Kangaroos). However, only the 1d and the 6d Engraved Kookaburra were ever proceeded with. Primarily due to the cost. The 6d Kookaburra was similarly printed in small numbers and the 6d Kangaroo it was to replace lasted right up till the mid-1930s.
The KGV 1d engraved was very much a political statement by a new, conservative, Cook government determined to doff the Australian forelock to King and Empire. The incoming Postmaster-General, Agar Wynne, made it one of his priorities to expunge the 'republican' kangaroo and map design introduced by the outgoing Fisher Labour government, a design for which the former Postmaster-General Charles Frazer had been responsible.
Wynne's plans for a new series of stamps to replace the Roos largely came to nought mainly because of two factors: the Great War broke out in August 1914, and a month later the Cook government lost office, replaced by another Andrew Fisher Labour administration.
By the time conservatives were back in power, after the War, pretty-well everyone saw the symbol of nationhood, as postage stamp designs, in a much different light.
There is a sad quirk to the story. Charles Frazer was saddened rather than angered about the plans to do away with his Roos, but his successor Wynne was not to be turned, and in fact his intention to change the design to something other than the Labour kangaroo was his first officially announced policy (2 July 1913) when he took over as PMG.
Charles Frazer, who had not enjoyed good health for a few years, died after a brief illness, less than a fortnight before the KGV 1d engraved was released for sale in December 1913. He was 33 years of age.