The story of Causemann . . .
. . . (and I'm sure your spelling with an e is correct as you dealt with them directly) is shrouded in mystery. They were rumored to be the manufacturer responsible for a run of well-made dials. Erich [log-in: mac_omega] devoted a page in his Omega chronometer tome to them. I recall seeing them for sale on the internet, but not in the last ten years, and possibly longer.
Causemann dials can be identified by a lack of manufacturer's marks on the back per Erich. Here is a ZJ Flückiger dial from a SM XVI . . .
. . . where their initials ZJ can be seen near the center. Original chronometer dials would have similar markings from the handful of specialist manufacturers. The Causemann dials lack them.