I do think I have read or heard that it might have gone the other way Anne admittedly (Bohemian to France).
I've wracked my brains but in my memory I can only come up with Legras for that shape, which is irritating.
However if there was another maker I wonder why it's not more prevalent on the net somewhere?
I'm just thinking that if Fritz Heckert did make it, then where are the other examples with different enamelling on them if you see what i mean?
m