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Regarding the "Tretubi" it only stated that the main three tubes were of a similar tubing, whilst the forks where of different type.
But it doesn't mean it's high or "low" quality. Columbus Aelle is just for different use than SL.Mine's also Tretubi, but it's Tretubi Aelle (26.8mm seatpost). Your's is probably SL.
anidel
@WimVDD
I'm trying to find out what year mine's from. Must be post '78 because Moser won the Super Prestige Pernod that year and it has a decal referring to that event. Hoped to find a stamp on the rear derailleur (Patent + year) but it only says "Patent" so the groupset is of no big help (except Nuovo Gran Sport was produced from mid seventies to mid eighties).
Headset has no brand on it so that's unknown to me.
Seatpost is a 27.2 mm so this could be an indication of the tubes being Columbus SL. Same goes for the decal indicating "Tretubi": most frames with this decal had the 3 main tubes made from high-level SL (or SP when a large frame) tubing, later tubesets had decals with more specific indications (that's why I first thought yours with Aelle-decal was from later date).
Pedal cages are not pantographed.
I will post photos as soon as the work is done. Hae to get started with the wheels and those really look bad...
And yes, you're right: both are great bikes. ;-)