I've seen this series once before but blanking on the name, maybe it will click in later today. Pretty sure the original Italian set (which I think these are) was copied later by an Asian firm like Long Shen.
Bingo: this pattern is called "Nash" and not positive who made it first but possibly Silva, it's sold as a set (BB shell plus lugs) by Ceeway.

Additional edit: there's this old thread where a poster in Hungary had a "Pinarello" with Italian threaded BB shell, so possibly this frame also used the original Italian set that Long Shen copied, unfortunately the image links are broken except for one that shows the headlug:
Interesting lugs...