18.5 inch seat stamped regular tree measures 5 inches dot to dot. Dominus saddles are the original company before it became Amerigo. Top quality saddle, with very little use. Wool flocked, Y girthing system, very secure and comfortable with generous blocks. Comes with Stubben leathers and metlab irons. Please see pictures, the ONLY blemish I see is a slight discoloring on the top of the cantle. Lovely saddle at a low cost.