Okay Stuart, here we go.
As far as I know, this vehicle originates from the river Main Frankfurt. With cleaning the ground of the river, the Messerschmitt was lifted, and a club member, who noticed what's going on there, took the poor car ( or should i say the rest) home.
I was also told ,the Schmitt was on display at the cologne Messerschmitt anual meeting in a paddling pool.