I'm new here, just arrived. Can't tell you much about the brand I'm afraid, like you I hit a few dead ends on the research. I do own an early 80's Red Paganini Sioux though. Love the bullet rear stays
Bought it from Halifax last year in a right state. Thankfully the frame was immaculate. I noticed that when I bought mine 3 others surfaced in a 3-4 week space on Ebay ALL around the Halifax area. The others where Pale Blue Sioux's though.
I got to thinking maybe someone out there was a Paganini dealer (will dig their name out for you). Anyways Lee IMHO Paganini's are extremely under-rated. The finish is 100% top quality. Colour schemes eye catching without being blingy/guady. They ride like the wind, so tight, aggresive, and the actual paint job is top notch. It takes some going to scrape down to the bare tube
Tracked 2 others on Ebay this earlier year, both where just frames and my guestimate was late 80's early 90's. Not as good a finish as the earlier ones,but still well pantoed & chromed. Noticed a fair few subtle changes in the build quality. Mine is irreplacable and I have turned down 3 Colnago's that are not a patch on the Paganini IMHO.
Of the 3 blue ones, 1 was a frame only and it hit £400+. I baled out at £260. Hope this essay helps you in some way
My best to you, and if I get to the stage where I can post pics, I'll put mine up for a butchers
PS: "Thanks for that info Johnsqual, appreciate it buddy"