That's just the sort of frame a lot of us bought for winter training back in the mid 1980's, light, lively but with eyes and clearances for fitting mudguards, looks a bit like a Gazelle....
I 'd say almost definitly made of 531 tubing, look at the delicate seat stay points, the long spear point on the top tube lugs, Shimano forged drop outs, decent fork crown, good, if not top quality fittings, that were rarely mixed with cheap tubing (unless it's Italian, which isn't likely, I don't know of an Italian builder that used Shimano fittings back then)
As for not having gear lever bosses, frames built as winter trainers often didn't as many would be built with a fixed wheel, (the gear hanger was just there to give you an option).
Some builders didn't fit braze on gear bosses anyway to keep the frame as strong as possible. ( IIRC Mercx would not have braze on lever bosses on his frames )
Galli stuff is becoming collectable.
You've got me thinking now ......