Ian,

yes there is an expert on Prussian builder plates. His name is K.D. Pfennig. Please check out his remarkeable site
www.dit-modell.de
Please hit "Bauteile" next to the freightcar picture. You will find many images of old prussian Fabrikschilder.

Mr. Pfenning is reproducing them as foto etched spare parts. Some days back I got the chance to BETA test some of those 1:87 made plates. Found the result astonishing.

image

Peer

http://epoche1.blogspot.com/
http://austauschbauart.blogspot.com/