Would like to be aware of any other tube marks like does the term Bhler precede Antinit Stahl or some other name, or nothing? The tube effort was either sourced from the Carl Gottlieb Hnel concern with Gebhard Helmuthhauser efforts or possibly by Gebhard Helmuthhauser alone. Not sure of the Rhombus touchmark, whether it is Hnel's or someone else's. Yes it is a 1924 vintage. Anything on standing breech?

Kind Regards,

Raimey
rse