[h=2][/h] Could he have been a fireman? There's an Alwyn Davies (27yrs) mentioned on the Australian Historic Newspapers website
Home - Trove as being injured in a great fire in a Sydney Woolstore in 1935 - age is only a little out. Put in "Alwyn Davies" in the search to see the articles. Can't see any other possibilities on there. You could try to find their wedding also, but I'm guessing that Marge was her nickname so I haven't tried. Try various spellings.
Can't find a death for him in the NSW online registers under Davies or Davis but they only go to 1980.