This particular, near perfect, example is a later version, possibly from about 1970. Some of its attributes are:

• It has the unique Gran Turismo hanger plate.
• It has a cable adjuster.

• Derailleur brands: Campagnolo
• Categories: Campagnolo - touring with terror
• Country: Italy
• Date of introduction: 1970?
• Date of this example: unknown
• Model no.: 2270?
• Weight: a terrifying 435g including hanger plate
• Maximum cog: 34 teeth (Sutherland’s 3rd edition)
• Total capacity: 36 teeth (Sutherland’s 3rd edition)
• Pulley centre to centre: 81.5mm
• Index compatibility: friction
• Chain width: 3/32
• Logic: top normal
• B pivot: sprung
• P pivot: sprung
• Materials: steel in quantities that you can barely imagine