following on dathai most likely family and searching for ballydown, I came across
http://www.libraryireland.com/UlsterDirectory1910/Islandmagee.phpMann, David, sailor, Ballydown
Mann, David, master mariner, Corner house
Mann, John, master mariner, Hillview cottage, Cloughfin
Mann, William, master mariner, Millbay
Mann, Thomas, sailor, Ballytober
A remarkable record for a surname occupation in a small community. I quickly became convinced he must have a record in Kew London as Merchant men and officers were highly prized by the Royal Navy Reserve, but I was unsuccessful.
Some Church records exist ISLANDMAGEE, CO. ANTRIM as found on PRONI website
C.I. Islandmagee (Connor diocese)
[Earliest registers destroyed in Dublin]
Baptisms, 1879-1917; burials, 1878-1915; vestry
minutes, 1879-99. MIC1/87
P. 1st Islandmagee
Baptisms, 1829-1935; marriages, 1829-1905; marriage
notices, 1953-6; communicants’ roll, 1874-1903;
committee minutes with printed stipend lists, 1859-75. MIC1P/326; CR/3/64
P. 2nd Islandmagee
Baptisms, 1854-1937; marriages, 1848-1933. MIC1P/337
R.C. [see under LARNE]
Could this be him
http://www.lennonwylie.co.uk/nopcomplete1943.htmNorthumberland Street
from 148 Shankill Road to 1 Falls Road
a John Mann is living at No80 in 1943 No occupation is filled in.
Would a Larne newspaper have reported his obituary?