“When Jimmy Kelly began his international career in 1931 there were, in effect, two Ireland teams, chosen by two rival associations. Both associations, the Northern Ireland - based IFA and the Irish Free State - based FAI claimed jurisdiction over the whole of Ireland and selected players from the whole island. As a result several notable Irish players from this era, including Kelly, played for both teams. In 1936 Kelly had the unique experience of playing for two winning Irish teams within a week. On 11 March he helped the IFA XI beat Wales 3-2. Then on 17 March he was on the winning side again as the FAI XI defeated Switzerland 1-0.”
from http://en.wikipedia.org/wiki/Jimmy_Kelly_%28Irish_footballer%29
Unique! But it looks like he never had to make the decision he would have been faced with, if Northern Ireland had ever had to play against The Republic during his career. Of course he coulda played on both sides, one half for the north and one half for the Republic. We kids used to switch sides often during a game ... when football was fun. Football Without Borders! (like Doctors Without Borders ... good for you) Jimmy Kelly, true ambassador of football!