Hi there,
I think you will find your chap's birth was registered in NSW

Robert W BOWMAN, son of Percy W and Mary E, registered Paddington 1912. NSW BDM ref 7864.
The cheaper option of ordering an official transcription gives you the same info as on a real deal cert. The info on the registration includes :

the baby's full name (christian name/s and surname), sex, date and place of birth

Baby's Mum's details including full name and maiden name (and any former names), age, occupation, place of birth

Baby's Dad's details including full name, age, occupation, place of birth

Date and place of baby's Mum and Dad's marriage
:)The names, gender and age of any older siblings (from that marriage) and just their age and gender if they have not survived.
http://www.bdm.nsw.gov.au/familyHistory/howToTraceYouFamTree.htm#TranscriptionAgenthttp://www.bdm.nsw.gov.au/familyHistory/searchHistoricalRecords.htm Cheers, JM