I didn't catch the right-side leg resting on a cinder block, good eye and thank you.Could be a 14 1/2". Just looking at that photo, unless he wants scrap price for it, I'd pass. Someone has chopped the legs on it and the lathe is sitting with most of the base cabinet in the air, based on what I can see in the photo. Big potential for having put a bow in the bed if it's really sitting that way.
My feelings are that if looks like it has been maltreated, it probably was.