Just checked the Electoral rolls for SA and in 1943 Arthur Dallison and Stella Dallison are living at Watervale.
In 1939 and 1941 there is a Stella White living at Watervale, SA.
So this narrows it down a bit: There is no Stella White in 1943. So b/n 41 and 43, probably 1942 to make the 1943 roll.
Stephanie