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Got this and know what it is, but not quite how it measures. One side of the scale is marked GRAMM. Have checked with BP and it´s fairly accurate. It goes up to 4 grammes but the scale on the opposite side reads 10 (2 reads 5). So it can´t be grains. It could well be German and was obviously made for BP in that era. Can anyone help with the non-gramme scale?
It is a BP powder dispenser.
One scale is in grams, but since the density of powder can vary, it is really a volumetric measurement, not a weight measurement, So the other scale is calibrated as a volumetric measure - most likely cubic centimeters. Many BP shooters prefer a volumetric measurement to ensure a consistent filling of the cartridge case.*
Take an old disposable plastic syringe (from your doctor, dentist or "Apotheker"). Cut the end off closely. You now have a plastic dispenser calibrated in cc.
Use the syringe to dispense 5 cc of BP or something like sugar or semolina into the powder dispenser and see how it matches up to the scale on the brass.
Let me know if I am right!
*With a bit of practice in consistent filling and dispensing one can easily achieve a +/- 0.2 grain tolerance in a powder charge. To do better with a weigher is extremely time consuming and not worth the bother with BP charges of 40 grains or more.