I'll tryto re-word .
The paper I am referring has the heading - Deaths registered in the District of Sydney, in the state of New South Wales by Jack Hayword Watson, Registrar-General.
Here in the UK, we would call it a death cert.
It does say First Marriage - Sydney NSW - Jack James STEEL. ( but the information I have is Jack was her de-facto husband and, never married)
Her daughter Jacqueline was the informant and, perhaps thought her mother was married to Jack.
That's as clear as I can make it.
cupcake