Mary Ann was born about 1869. Mary Ann Spicer ... He passed away before 1920. [1]
1865, Newington, mother Knight: https://www.findmypast.co.uk/transcript?id=BMD%2FB%2F1865%2F1%2FAZ%2F001253%2F130
1863, Holborn, Brown: https://www.findmypast.co.uk/transcript?id=BMD%2FB%2F1863%2F1%2FAZ%2F001191%2F038
But there are lots of possibles just in the London area.
No sign of children in the Islington area after the marriage, nor can I find Mary in any census return in the UK.
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