Dear Cando,
I think I can safely say that Archibald was a baker, although when a good job is on offer, you could change. Archibald was a baker in Markethill, County Armagh and then in English Street, Armagh City. Archibald had a brother, John who was also a baker, although as far as I know, he did not emigrate to Australia. John was alive in 1837. I can't decide at the moment if Archibald (1838) is my man, early days yet.
Yours etc., Newgent.