Besides W. Förster, the following would have peddled similar examples & it seems that they may have ordered a gesteck or parts kit from their Belgian counterparts(like DUCO) and have it completed in Zella - Mehlis or less often Suhl. They made more money this way.

F.W. Vandrey

O. Geyger

J.J. Reeb

Ludwig Schiwy

I may have missed a couple so I'll check further.

Cheers,

Raimey
rse