Prince's Polly was a "lengthy, deep-girthed"[2] bay filly with a broad white blaze bred in Ireland by Tom Nicholson, a farmer from County Kilkenny.
Over the same course and distance in August she finished second twice, beaten three quarters of a length by Fly Street in the Ardenode Stud Stakes, and a neck by Woodstream in a minor event.
Ridden by the veteran Wally Swinburn she took the lead early in the straight and won by two and a half lengths from Realms Reason, to whom she was conceding six pounds.
The English 1000 Guineas winner On The House started the 3/1 favourite ahead of Woodstream, Mary Mitsu and Miss Lillian with Prince's Polly, ridden by Swinburn, going off the 12/1 fifth choice in the betting.
At the same track on 17 July she started favourite for the Irish Oaks over one and a half miles at the Curragh but was unable to catch the front-running Swiftfoot and was beaten three lengths into second place.
In August she was made odds on favourite for the Brownstown Stakes at the Curragh but after briefly taking the lead she faded and finished sixth behind the Vincent O'Brien-trained Miraflora.