This beautiful models were hand made of latex with real hair in the late 1960's and early 1970's by the now-famous sculptress Pamela DuBoulay, now well known for her work for the Franklin Mint and the amazing "Horse with the Golden Saddle". I believe these 5 to be among the very few (and perhaps the only examples) in the United States as most are still prized by collectors in the UK.
See more examples in the Model Horse Gallery
JALEEDA - Rare and lovely Rydal Arabian mare in chestnut
JAZMIIR - Another chestnut Rydal Arabian mare, this one more of a liver chestnut with a flaxen mane & tail
CALLISTO - Another chestnut Rydal Arabian mare
DEIMOS OF AMARNA (Formely "NIGHT VIGRANT")- The Matching Rydal Arabian stallion
KEROUAC - Rare Rydal Donkey finished by Keren Gilfoyle-McGroarty