This is a workable copy of a 1950s Campagnolo Gran Sport. Even the details are pretty correct except for the pulley cage plates - which have strange and function-free extra struts.
This Ludoal Gran Sport is extremely similar to some Gambato Gran Sports - but their are significant differences:
- On the Ludoal the main Allen bolts at the b-pivot and the p-pivot are very like the Campagnolo design - which is not true of the Gambatos.
- The Campagnolo has a 43mm pulley cage, this Ludoal has a 44mm pulley cage and the Gambatos has a 45mm pully cage. Why? Who can say.
- Derailleur brands: Ludoal
- Country: Argentina
- Date of introduction: 1967?
- Date of this example: unknown
- Model no.: unknown
- Weight: 290g
- Maximum cog: 32 teeth (Campagnolo’s unlikely figure for the Gran Sport)
- Total capacity: 26 teeth
- Pulley centre to centre: 44mm
- Index compatibility: friction
- Chain width: 3/32”
- Logic: top normal
- B pivot: unsprung
- P pivot: sprung
- Materials: largely bronze, with steel parallelogram plates