Sid,
Thanks so much for a very speedy response - the age at death gives a birth year of 1886 so I am cautiously optimistic that this could well be my husband's great uncle. I do know he was married as when my brother in law (sadly now deceased) was in the Navy in the early 1950's he visited them on a farm outside Adelaide. My husband remembers a photo of his brother with a koala bear accompanied by an elderly man and woman. I will look into getting a copy of the death certificate.
In appreciation, Fairlane