I'm not sure if they are a proprietary or standard pattern but those head lugs were common on 1960s ad boom era Torpado bicycles. Consequently, my prime candidate would be a Torresini product, either a contract manufactured marketing brand or a secondary Torresini brand.
The Nuovo Record rear derailleur seems out of place, as are the shift levers. However, the Valentino front derailleur appears OEM and would place it very late 1960s to boom era. The presence of a rear dropout with derailleur hanger, in conjunction with the apparent era, suggests the frame is at least mid-range. The Universal brakeset goes back tot the very early 1950s but was available though the 1970s and a common spec on Italian Condorino style bicycles such as this.
The serial number may aid in identifying the source, while the seat post diameter may aid in determining the grade of the frame tubing.