[milandro]

well, I found quite a few armies with similar insignia for radio communication specialist

The German army has the closest resemblance


But the workmanship of the guard is very very crude , I cannot believe that this would be an army issued weapon. Certainly NOT if this was made in the radio days, even the earliest it would be , at best the early 1900.

The " crest " is, I believe, not at all a crest of any sort. Germany did have colonial troops operating in many theaters at the time and its insignia MAY have inspired someone who ha nothing to do directly with Germany to make such a weapon.