Go to the Australian Defence Department at
http://www.defence.gov.au/gallery/
>> Select "Search by Term"
>> Enter the literals "Series 1" and fire off the search
When you get a selection of pictures and if you've got a good connection choose the hi-res option.
The pictures I like best are;
* the Avro 504K in RAAF colours
* the Hispano-Suiza powered SE.5a which is actually a WW1 RFC/RAF picture not RAAF.
* The Viper powered SE.5a which could be RAF or RAAF.
If you've got more time have a browse of the gallery.