Yes indeed. A Zella Sankt Blasii - Mehlis example from September 1923.

One sees that stamp on wares from Hänel where they were completed by the most competent mechanic Gebhard Helmuthhauser / Gebhard Helmuthäuser or Gebhard Helmuthäuser who was listed @ Bergstraße 1 or Gebhard Helmuthhauser / Gebhard Helmuthäuser or Gebhard Helmuthäuser was sourced for the tube work. I am not sure on the single >>K<<.


Serbus,

Raimey
rse