Yeah, Gebhard Helmuthhauser / Gebhard Helmuthäuser / Gebhard Hellmuthäser or Gebhard Helmuthäuser who evidently worked @ Haenal.
>>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<<.<<
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=577354&page=5But on this thread it is possible that the single K could be König. Difficult to say.
Serbus,
Raimey
rse