The Zeus Alfa 72 Especial is a reasonably faithful copy of a 1966 Campagnolo Valentino Super. Campagnolo had ditched this design in favour of the Valentino Extra in 1968 - but that does not seem to have diminished Zeus’ enthusiasm for it - even in 1972.

The Alfa 72 Especial is strong, nicely finished and terrifyingly dull.

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• Derailleur brands: Zeus
• Country: Spain
• Date of introduction: 1972?
• Date of this example: unknown
• Model no.: unknown
• Weight: 261g including hanger plate
• Maximum cog: 28 teeth?
• Total capacity: 28 teeth?
• Pulley centre to centre: 46mm
• Index compatibility: friction
• Chain width: 3/32”
• Logic: top normal
• B pivot: unsprung
• P pivot: sprung
• Materials: steel