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. Seabiscuit was available through JCP in 2003 with doll jockey Red Pollard. On the 2008 Retired List.
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.