A friend has this original Wehrmacht instructional book on sign painting. There are some illustrations of writing stuff inside. The dip pen nibs shown are from Brause, Soennecken and Heintze & Blanckertz. The waterproof ink and paint is from Pelikan.
Vintage Heintze & Blanckertz nibs can still be found. The Berlin factory was destroyed in WWII and after the war a new factory was built in Frankfurt am Main. The “Berlin” marked nibs are all from before 1945.