Just off the top of my head I would think more Ideor (as Juvela mentioned) than Galmozzi. Although there's Galmozzi styling cues, the lugs do not appear to be thinned at all. They are really clunky, more along the lines of a production frame like Ideor. But who knows, there were a lot of Italian bikes with similar features in the late 50's early 60's.

I would search photos of Ideor for similarties, keeping in mind this frame has been updated. And I guess get that paint off. Might be some signs of head-badge holes under the paint you could measure and compare to the spacing of Galmozzi and Ideor badges.