This model was originally sculpted by Kitty Cantrell. You can see more of her work at her website: http://www.kittycantrell.com/stonehorse.htm.
The Chips Pony 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 painted release was on two models called Dark Palomino and Gray Pony Chip in 2007. You can view more pictures of him here: http://www.stonehorseref.com/node/12905 and here: http://www.stonehorseref.com/node/12906.