Seat size is measured differently and is scaled differently for English and Western saddles. All types of English saddle seats are measured from the metal rivet (or screw) on the side of the pommel (front top)...
This is the best book that I have found to serve as an all around resource/field guide when I am Heisey shopping. It contains lots of pictures to help identify most common patterns, and prices to serve as a ge... read full review