I have a Duett Largo dressage saddle for sale. It is an extra extra wide-38 cm. It is cutback, and measures an 18 inch seat, but fits smaller, more like a 17.5 .
It has been used on a Canadian and on a Percheron cross. It will be best suited for a large bodied horse, and will fit a large horse with an average wither. The saddle is in very good condition.