• Derailleur brands: possibly Sartel, possibly not!
• Themes: Ultra-lightweight - single pulley models
• Country: possibly Belgium, possibly Czech Republic
• Date of introduction: 1943?
• Date of this example: unknown
• Model no.: unknown
• Weight: 159g
• Maximum cog: 24 teeth (Sartel instructions only quote ratios up to 24 teeth)
• Total capacity: unknown
• Pulley centre to centre: none
• Index compatibility: friction
• Chain width: unknown - but the pulleys are narrow
• Logic: low normal
• B pivot: sprung
• P pivot: none
• Materials: largely aluminium

Ref. 522