and it's by his namesake, but no relative, - charles turner, isn't it? - yes. me, how did you get it? it came to my wife whose grandfather was a descendant of turner's. i see. straight through the family? - yes. - fantastic. maas: the owner of it was descended directly from turner, the painter. and so it began to all add up into a really precious object. the two turners had a very unique relationship. they worked very much together. they were fellow students at the royal academy. and turner would go out and he would search for views that would look well in engraving. and together they published them, - and money was made. - right. and we believe tt some of the little pencil scribbles on it are by turner himself. i saw the pencil marks. you can see them up here in the hills. it was quite clear that somebody had drawn on it in pencil, and there was lots of marks on it. and somebody was trying to get that mezzotint looking right. now the question is who? now if it had been charles turner, the mezzotinter himself, well, perhaps that would have been just a little le