This is a superb Choice Uncirculated Ireland 50 Pounds ND 4.4.77, it does have a fancy Serial Number 01A007777, it is the last date of issue. This note is certified by a third party as PMG 64. It has a minor pen ink on the bottom right margin, please see the scans.
Lady Hazel Lavery in Irish National costume with chin resting on her hand and leaning on an Irish harp. There is representation of river gods at center on the back.