Ah, looking at the National Archives of Australia website, they have the records for Victor Raymond Watson, SERN 573, born West Maitland, NSW, enlisted West Maitland, NSW, next of kin Mrs Watson, and you can view his records online for free:
http://recordsearch.naa.gov.au/Searc...1915284&isAv=N
(click on view digital copy)
His enlistment date is the same as in post #1 so must be the same person.
He also served in WW2 (if it is the same person - year of birth is a few years different but maybe he didn't want to be classed as too old?), but those records aren't available to view online, only the catalogue entry:
http://recordsearch.naa.gov.au/Searc...5602879&isAv=N