This model was originally sculpted by Hilary Hurley. You can see more of her work at her website: http://hhhorses.com/stonearab.html.
The Arabian Yearling mold was finished in 2006, and as you can see, on many of the models today, that original date is still marked underneath the back legs. The first edition model was called Bernadette in 2008. You can see more pictures here: http://www.stonehorseref.com/node/13745.