A charm-free Taiwanese copy of a mid-range late-1970s Shimano derailleur (500GS perhaps?). I have no real idea of the date of this model, but have an abiding memory of its charmlessness.

• Derailleur brands: Lepper, manufactured by SunRace
• Country: Netherlands, manufactured in Taiwan
• Date of introduction: 1984?
• Date of this example: unknown
• Model no.: unknown
• Weight: 273g excluding the missing cable clamp washer
• Maximum cog: 34 teeth?
• Total capacity: 34 teeth?
• Pulley centre to centre: 75mm
• Index compatibility: friction
• Chain width: 3/32”
• Logic: top normal
• B pivot: sprung
• P pivot: sprung
• Materials: largely steel with an aluminium rear knuckle