Black, 16", all-purpose Courbette saddle. I've ridden in this saddle about 10 times before I took it to the new barn I ride at, where I found out it was too small for me.
It's made out of treated leather so it's water resistant. All you have to do is wipe it off with a damp cloth to clean.
It's in excellent condition, not a mark on it. Gel padded seat, it's very comfy.
Not sure what size the tree is. =/
Asking price is $350.00 OBO.