Passoni is an italian brand.
Emilio Riva was a road racer of the heighties who decided to build his bike in 1989. Titanium was a new material for building bikes (after Telledyne in the 70ies, and Merlin who begun in the mid heighties…)
A passoni is made with titanium grade 9 (I think, the same alloy than 3A-2.5V) and they make themselve the tubes with a titanium plate. They round it and weld. They use different thickness and a passoni is a real custom bike. They draw the geometry for you, and make the bike stiff or not like you want. The welds are
In 1990, they sale 2 bikes : the top titanio, made for racing, and the primo (mine). A passoni was totally made in titanium : frame, fork, the stem-drop bar combo, seatpost…
Passoni built mtb too.
Here's one of the first picture I found in a 1990 french magazine :
The weld work were ever amazing.
of the try of my primo in a french magazine
I knew Luca Passoni personally and had some business dealings with company. The more correct history of Passoni dates back to the 70's, according to Luca, the Engineer Riva built his first TRECIA branded bike in 1972 (so alongside Teledyne time-wise). The bicycle business was however only a sideline for Riva. In the article that is highlighted in the French magazine that is linked to, it speaks of Riva then having built for 12 years, hence a 1978 start. Either way, the progenitor of Passoni bikes was built in the 70's.
In 1989, Luca Passoni took over the business and run it until his suicide a few years back. Today it is run by his widow. When 24"'s bike was built, they were still using sheets of titanium which were then formed and welded into tubes. Later the Passoni production was largely farmed out to Bertoletti in Italy who used tubes supplied by outside suppliers with the completed frame then sent back to Passoni for final filing and preparation. Bertoletti now collaborates mainly with legend bike for its titanium bikes: http://www.legendfactory.eu/home/
I have shown my own personal Passoni to numerous titanium frame builders and it takes them all a while to figure out how the whole thing was put to together.