- Derailleur brands: Sartel
- Themes: Ultra-lightweight - single pulley models
- Country: Belgium
- Date of introduction: 1939?
- Date of this example: unknown
- Model no.: unknown
- Weight: 161g
- 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
