Hi
According to Johan and Mary Ann's marriage reg in 1874, his place of birth was LONDON and Mary Ann's was Browns Diggings - I would imagine that this was on the goldfields in Victoria. The marriage is Ref No 4362.
I can't see Mary Ann's birth in Victoria.
She was born her as here is the arrival of her parents from
http://proarchives.imagineering.com.au/index_search.asp?searchid=23WARKE Mrs Age 20 MAY 1854
GUIDING STAR Port B Fiche 068 Page 003
WARKE Alexander Age 19 MAY 1854
GUIDING STAR Port B Fiche 068 Page003
There are 5 children born to Alexander WARKE and Jane McKAY between 1855 and 1866. It look as though Mary Ann's birth was not registered. Let me know if you need these details.
Mary Ann's death
JACOBSON Mary Ann
Father Alexander WARKE Mother Jane MACKIE Death Place Footscray Age 70 Yr 1927 Ref 10023
I also noticed a death in Footscray for a Johann - I am only presuming it is him
JACOBSON Johann Nicholas Father Peter Nicholas JACOBSON Mother Christina JENSEN Death Place Footscray Age 79 Yr 1929 Ref 9475
and the deaths of their chn
JACOBSON Sylvester George Age 70 Yr 1960 Place of death Footscray Ref 30180
JACOBSON Alexander Victor Age 76 Yr 1963 Place of death Sealake Ref 247
VAUGHAN Letitia Marion Age 89 Yr 1971 Place of Death Heidelberg Ref 5330
VAUGHAN Helene Marguerit Age 98 Yr 1978 Place of death Heidelberg Ref 17213
Cheers
Cando