In the early 1970s Kawamura (Nishiki) had to switch to straight gauge on the 25" / 63.5cm Semi-Pro / Competition frames, because of oscillation problems. Even their double-butted frames were not particularly light -- the best I could do with my Nishiki Semi-Pro was 25lbs with tubulars and a Brooks Pro saddle, which wasn't much lighter than a UO-8 with aluminum cranks and tubulars.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069