The 1923 marriage info was given by me on that post 6 yrs ago

I will ask the moderator to merge the posts to avoid further duplication
Geordie - your best way forward is as I outlined above. Buy a copy of the marriage cert as the info on the 1939 register does not support a birth in Newcastle See further info belowThere were 3 births to the 1923 marriage between 1925-1935 which can be found on freebmd
William died 1946 Devon
Did Mary re- marry 1947 to Frederick G Bartlett? She died as Mary Ann D Bartlett in 1994 - same birthdate as the 1939 entry
Births September qtr 1896
Palmer Mary Ann D St. Thomas 5b 36
So where did Newcastle come from?
Per GRO online she was Mary Ann Daisy Palmer mmn Blackler
There is an 1890 marriage on freebmd - Frank Palmer with a LILY Harriet M Blackler on the same page but there are other Palmer/Blackler marriages
Suggest you check the 1901 and 1911 censuses or buy a copy of her birth cert