27.0 is correct, I had a bianchi and colnago 27.0
online catalog of this era:
http://www.atala.it/index.php?option=co ... Itemid=701
history ( brief )
The company was started by Gatti in 1919 and formally founded in Italy in 1921 by Cesare Rizzato and was notable for its racing bicycles which won several championships in the early 20th century. The company also had some championship success in the 1980s before hitting financial difficulties. Part of the company was sold in 2002. Now the 50% of the company is owned by Accell Group. The company also produces bicycles for the brands "Carraro", "Whistle USA", "Maino" and 'Dei".
If you are restoring, T-cut then fit some NOS decals and wax well...luvverley...
http://www.ebay.com/itm/ADHESIVO-PEGATI ... 3a6d481ea2
Colnago Super, C record Delta 7v,
Olagnero Signature Model, DA 7401
Battaglin EL101 tubing 8v
Wilier Campagnolo 8v Record
Daccordi Furioso, Campag Veloce 9v