There is a public tree for this couple which seems mostly well-researched and has some documentation shown.
Apologies if some of this has already been posted.
The tree gives a death date for Henry Palmer 16 Dec 1877, Launceston and for Mary Ann 6 Nov 1864, Hobart - however there is no link to documentation for these dates.
Mary Ann was born in Hobart, 8 December 1817 (shown on Australian Birth Index)
Mary Ann Robinson
Birth Date: 8 Dec 1817, Tasmania, registered 1818 at Registration Place, Hobart, Tasmania, #581
Her parents were married:
Edward Robinson, Elizabeth Burn, 24 Dec 1816 at Hobart, #245
Edward was a convict (born Lincolnshire) arriving per Indefatigable, 1812. By 1817 he was appointed 'overseer of Government carpenters'
Elizabeth"s birth (from Australian Birth Index), noting date of registration of the birth - perhaps she needed it for her marriage.
Elizabeth Burn
Birth Date1797; Birth Place Tasmania
Registration Year1816, registered at Registration Place, Hobart, Tasmania, #474
Edward and Elizabeth apparently had 8 children.
Judith
Thanks Judith, I did see this public tree but was not enough info (for me) to understand how they came to the conclusion with those deaths for Henry and Mary Ann, obviously some families have more inside info through their descendants that I may not necessarily have access to. Yes a good possibility for Henry Palmer, at least the age is consistent, definitely 70 as died of senility, I'll see if I can find a will or anything about a billiard maker to see if I can make a connection or rule it out.
However, I don't quite follow the Mary Ann Palmer death they have in 1864, I filtered all the Mary deaths in 1864 until I found record for that date and it was for a Mary Ann Watson, b.~1822 Ireland, boatbuilder's wife (we do have Watsons in our family), but in my eyes I am 99.999% sold on Tas Tyger's 1850 Death for Mary Ann Palmer.
And yes, Elizabeth Burn seems to have been baptised age 19, 5 months before her marriage to Edward Robinson, possibly as the father was not named or unknown, I have not yet investigated the family that far back yet.
Many thanks.