My question as to which German ceramics works made pieces similar to Bitossi, has been answered by this large handled pot. Its marked BAY W.GERMANY 225-30 on the base.
I've taken pics. of it with a piece of Bitossi on either side. The patterning is very similar, but less rustic looking, and the colour similar to Bitossi's Rimini Blu.
I would imagine that my bull was made by Bay too, but can't confirm either way.