Nice insight Axel. I'd also guess that the cartridge is one of Teschner-Collath's proprietary ones. Didn't Teschner-Collath have their on needlefire cartridges and they converted some of their centralfire guns to shoot both their needlefire cartridges as well as center-fire ones? Also, why so many Krupp steel stamp types? Did each tube maker have their own steel type(Krupp, Wittner, etc.) stamp?

Kind Regards,

Raimey
rse