This shirt was worn by Paddy Mulligan playing for a League of Ireland XI against the Scottish Football League. The match was played at Celtic Park, Glasgow, on September 7th 1966. It was not one of Paddy's finest ever performances - the Scottish League won the match 6-0!
After the match, Mulligan swapped shirts with his opposite number - the Glasgow Celtic legend, Bobby Murdoch. There is a photo below from the match programme which shows that both players wore the Number 4 for their respective teams. The shirt remained in Murdoch's family until very recently when it was auctioned along with many of Murdoch's shirts and medals at Christie's in London. I was fortunate enough to win the auction for this shirt!
The shirt is a green, short-sleeved, shirt with the Number 4 sewn onto the back. At this stage in his career, Mulligan was still playing for Shamrock Rovers; he would not make his full senior international debut for Ireland for another three years. However, he was destined to win 50 caps for his country and to play for several English clubs - Chelsea, West Brom and Crystal Palace.