Seabiscuit Collection. The movie "Seabiscuit" based on the book by Laura Hillenbrand was released July 2003, and Breyer released their version of Seabiscuit and War Admiral mid-year 2003, so they were not pictured in the 2003 catalog. On the 2004 Retired List. The blanket pictured on the model is an aftermarket accessory and is not a Breyer product.
In 2003, the JCPenney catalog pictured Seabiscuit with Jockey, however I found a box with a War Admiral, JCP #671-1138 and 2003 box catalog. The box looks big enough for 2 models, so I'm assuming this was a set released by JCP, but not pictured in their catalog. Ongoing research to find more information.