This saddle is a 17 1/2 Id say a medium tree. It has been a miracle saddle fitting an 18.0 warm blood I had to a 15.3 Thoroughbred. I have owned it for a year, and it is in beautiful shape. I have taken super good care of this saddle. The code inside the flap is L1553064 M DJ2 . Nothing is wrong with the saddle, I have a injury that will prevent me from riding.