No doubt Stu is right with Sawtooth.
A few years ago I had a guy I could buy tree seedling for at a real cheap price. I was buying several at that time. I ordered about 15 Chinese Chestnuts along with a bunch of other trees, and when they arrived I could see immediately something didn't look exactly right. They had brown leaves still hanging on the trees and resembled chestnut leaves but the shape wasn't right - they were Sawtooths. I only paid 70 cents apiece for them so I just went ahead and didn't say anything.
I wasn't planning on putting out any Sawtooths but set them and thought I could always remove them if I changed my mind. The biggest ones now are probably 20 feet tall already. I saw pollen this spring, but it is all grown up around them right now and I haven't walked out to see if there are any acorns.