This is a 17.5 inch Bob Marshall Treeless Sports Saddle measured the Bob Marshall way(11.5 inch leg opening+6 inches).  I am selling it to buy a 15 inch Bob Marshall barrel saddle since my husband has lost a lot of weight and we need a smaller saddle we both can ride in.  I bought it used so I don't know what model it is or how old it is but my guess would be about 3 years old and my husband used it for barrel racing and trail riding.  It shows hardly any wear at all, ridden in very little, excellent condition, never been bent, no folds in the seat.  See pictures and ask questions if you have any.  Shipping is $65.  No international shipping!