This coin with the L mint mark minted in London.
From the 3rd year of general coinage production.
On 2 January in this same year Australian philately properly began with the release of Kangaroo and Map series of stamps,
These featured kangaroo standing on a map of Australia, and were inscribed “AUSTRALIA POSTAGE”.
Please see the pictures.
Design
1911-1936 All One Penny coins in this period were as follows.
Diameter 30.8mm
Weight 9.45grams
Edge – Plain
Bronze composition: 97% copper, 2.5% zinc, 0.5% tin.
Obverse: Has a portrait of King George V by Sir Edgar B. Mackennal
Reverse: The words „ONE PENNY“ within a circle designed by W.H.J Blakemore
History
There were in total 5 varites of One Penny coins minted between 1911 and 1966 when decimalisation occured.
Mints: H – Birmingham  M – Melbourne  S- Sydney L- London
Mint Marks: H – Ralph Heaton Birmingham I – India