Unusual front sight need help I.D.ing

[Lugerdoc]

I agree with most of the above, but I would want to know if this front sight assy is sodered on or threaded. If the later, it may have been done during it's active military life, for the addition of a silencer, but likely later. I think that I'd rather own a silence ready luger, than a shooter with a terrible looking front sight assy. TH PS: most machinish or gunsmith can heat and remove this sight to solve the puzzle.