There's a baptism 25 January 1863, St Luke Marylebone
Monimia Ellen
parents Thomas + Ellen Archer
father Decd.
born 27 April 1860
I know there are many suggestions, but right now I'm following this lead trying to prove or disprove the hypothesis that:
Monimia's bio-dad was Thomas Archer
Monimia's step-dad is (Samuel?) James Negus.
It was looking good, until... And as I've been told I shouldn't be posting legible images, I'm going to give a sub transcription.
From Ancestry's scan of: London, England, Church of England Births and Baptisms, 1813-1917, Westminster St Luke, St Marylebone 1855-1892, pages 30-31 for years 1862-63:
I have:
Monimia Ellen Archer, baptised on 25th Jan 1863
Entry: 285
Parents: Thomas and Ellen Archer
<ignore address>
"By whom the ceremony was performed" in the right hand column, it says:
<Illegible name>
-------------------
27th April 1860
Looking at the other entries on those 2 pages, each entry has a date added to that right hand column.
Mostly that date preceded the baptism date by 1-3 months.
I propose that that date is actually a date of birth, recorded in addition to the official headings of the form.
That's unfortunate, as it suggests here DoB was rather earlier and may break my working hypothesis.
Does that seem like reasonable logic?