CJ:

Post a pic of the flats and the area ahead of the flats if possible.

The stamp "EINGTR. SCHUTZMAKRE" is for EINGETRAGENE SCHUTZMARKE or registrated trademark, I think. Circa WWI, the Franz Jaeger employed about 50 craftsmen so they could have easily have made any of the examples. I'm curious with that number if they alos dabbled in making tubes.

Kind Regards,

Raimey
rse