Jerry:
Any indication as to the steel type? I'd guess Poldi W02(Poldi registered trademark from 7/18/1893) or CKV for the tubes and maybe Poldi ATEM(chromium nickel steel) for the frame and various other parts. If not Poldi, then Witkowitz or Vitkovice Iron & Steel Works. I've been chasing the Danube Ironworks Company/Dunai Vasmu at Dunaujvaros) but can only trace it back to the 1950s. There was the Resicza Steel Works/Hungarian Steel & Munitions Works as was there Skoda(Emil Skoda with wing in a circle trademark from 1923), which had engineers that assisted Vaclav Holek and others at Ceska Zbrojovka(Czech Armoury) after pretty much all left the Praja Zbrojovka(Prague Armoury). There was a Rudolf Benes cat at one of the Zbrojovka, Brno or Prague, that was the head and the "B" of the "HB" designation is for Benes while the "H" is Holek.

Kind Regards,

Raimey
rse