Produced to celebrate the 75th anniversary of the founding of Sugino in 1910, this derailleur was manufactured by SunTour. It was a cross between the SunTour Superbe (5300) and the SunTour Superbe Pro (5200) with a light garnish of anodising. Aside from this it had all the usual virtues of the Superbes of the time including sealed bearing pulley wheels and stainless steel pivot pins that you can remove with an allen key.

For me this is one of my favourite derailleurs of all time, and I think it looks much better in its Sugino colours, with the bronzed pulley cage, than it does as a SunTour.

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• Derailleur brands: Sugino, manufactured by SunTour
• Country: Japan
• Date of introduction: 1985
• Date of this example: 1985 (two letter date code is BH)
• Model no.: unknown
• Weight: 179g
• Maximum cog: 23 teeth (Sutherlands 4th edition)
• Total capacity: 26 teeth (Sutherlands 4th edition)
• Pulley centre to centre: 52mm
• Index compatibility: friction
• Chain width: 3/32”
• Logic: top normal
• B pivot: unsprung
• P pivot: sprung
• Materials: aluminium (including the hanger bolt and the pulley centre bolts)