I haven't seen the flat myself Glen
The unpainted flat has a sword not so rounded indeed.
(http://i35.servimg.com/u/f35/19/31/59/25/nouvel11.jpg)
I also compared with a painting of Benedikt Widmann , I think,
(http://i35.servimg.com/u/f35/19/31/59/25/nouvel10.jpg)
It could be that the painter had worke on the sword, as I do myself when I sharpen the weapons before painting them, and so lost the original shape? It is so thin and easy to bend ...