1925, actually (1920 was a tough year in Ireland!). This one was published in collaboration with the Irish Press. Linguaphone released a longer course in Connacht Irish in 1928.
Both speakers on the 1925 records are natives of Cork (one being Ó Cuív himself).
Very nice of you to offer them, a Dhiarmuid -- I have a set already, but I'm sure someone here or in the Munster study groups (
http://groups.yahoo.com/group/TYIMunster &
http://groups.yahoo.com/group/munster_irish) would love to buy them off you.
Bye the bye, there's also a set for sale just now on eBay.
Le meas,
Cionaodh