This is one of two derailleurs in this collection that :

• Are clearly branded 'Campagnolo Gran Sport'
• Are not recognisable to me as anything that was manufactured by Campagnolo.

This example has a very beautifully made and finished parallelogram, with what look like high quality small parts. At first sight I guessed that it might be a genuine Campagnolo parallelogram - but, crucially, the p-knuckle does not have the typical pulley cage rotation limiting screw. The pulley cage is something else - it is aluminium and the outer plate has a shape that I have never seen on anything made by Campagnolo. Finally the chroming and detailing on the main b-pivot and p-pivot Allen bolts is not typical of Campagnolo.

The derailleur looks and feels as though it would work very well - with one proviso. This is that the head of the guide pulley pivot bolt has been filed down so that it does not hit part of the p-knuckle.

I obtained this derailleur from the UK but I have no real idea who made it, or when or where it was manufactured.

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• Derailleur brands: Campagnolo
• Categories: Campagnolo - the good stuff
• Country: Italy
• Date of introduction: 1969?
• Date of this example: unknown
• Model no.: unknown
• Weight: 222g
• Maximum cog: 26 teeth (based on a real Gran Sport)
• Total capacity: 18 teeth (based on a real Gran Sport)
• Pulley centre to centre: 43mm
• Index compatibility: friction
• Chain width: 3/32”
• Logic: top normal
• B pivot: unsprung
• P pivot: sprung
• Materials: bronze knuckles, steel parallelogram plates and an aluminium pulley cage

Ref. 1829