I see the confusion

What I said was
This may be a first marriage for Margaret's second husband.
MESSER Percy (born SOUTH YARRA)
JONES Eliza Ann
Year 1874
Reg 4582
This means
Percy MESSER (who was born in South Yarra) married to Eliza Ann JONES in 1874. Reg 4582.
Here is his parents' marriage in England.
Marriages Mar quarter 1851
MESSER James
TWINNING Charlotte
St Giles
1/69
I do not see Percy's birth.
Civil registration began in Victoria in 1853.
This is about the time of his birth according to the death details.
Perhaps it is not on the indexes for that reason.
Sue