So far, all arrows point to this being a song composed circa 1960 in Dublin by someone (or more) people associated with the Coffee Kitchen folk club.

If you are looking for working shanties from the days of sail, you could look in Sam Henry's Songs of the People Sam Henry's collection put into book form by the late Gale Huntington with assistance from Lani Hermann and John Moulden or the classic shanty book, Shanties from the Seven Seas by Stan Hugill.

All the best,
Dan Milner