Not to sure may have been 50s or there abouts, got an old race book somewhere with the picture of it on the front cover, one of the horses was called whimpy and the other knight owl, can't remember the third one, as a avid collector of old race books, I find them so interesting to look back on, did throw some of the 80s and 90s out when I was shifting, oh boy have I really regretted that, just looking at one now amberley gallops, may 1954, a great year,