I am not convinced the death cert or transcription, will really help you. Info is so sparse on SA death certs - no names of spouse or children in the period you are researching....and as I frequently write, the information on a death certificate is only as good as the knowledge of the informant, who it would appear in this case, if it is your Wm Chas, couldn't even detail his given names in correct order. Perhaps the place of burial may help if there is a headstone with more information noted.
From info on Certs in SA >South Australian>Australian Resources at top of the board
1908-1947
* Date and Place of Death
* Name
* Sex
* Age
* Occupation
* Usual Residence
* Birthplace
* Length of Residence in Commonwealth
* Age at Marriage
* Number of Issue Living and Deceased
* Cause of Death
* Place of Death
* Informant
1948-1967
As for 1908-1947 with the addition of
* Place of Burial
Just my two bob's worth.
I had a quick search of the 1939 Commonwealth Electoral Roll which only includes the metropolitan electorates of Barker, Boothby and Hindmarsh, but couldn't see an enrolment for Amy or William Charles FISHER. However he may not have lived in those electorates.
I have read all the newspaper reports and gazettes.
khicks
But not the death notices in 1954 and 1955....that would be my next step.
Cheers
Cando