17.5 inch, medium tree. Made by Thoroughbred Saddlery. This saddle is estimated to be about 25 years old, but has been well taken care of. This is the most comfortable saddle I have ever ridden in. The only "problem" with this saddle is that one of the billets has extra holes punched in it, but the billet is sound. Comes with girth but no leathers (they are custom anyway).
The billet with the extra holes in it:
NOW ON EBAY: Thoroughbred Saddlery dressage saddle. 17.5 inch, M - eBay (item 270650383449 end time Oct-23-10 10:30:37 PDT)
Or will sell for $400 plus shipping.