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Campagnolo gran sport derailleur dating question

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Not specifically. There is a specific order of iterations, but fixing the specific date of any one iteration is not generally in the cards. The Velo-Retro timeline gives pretty good guidelines for the introduction of each iteration, but it is also true that any one iteration could have been installed on a bike for years after the next iteration was introduced (as stock got used up).
 
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Thank you for sharing this very good question.

AFAIK this model of rear mech enjoyed a longer production life than any other from the manufacturer.

There were other models which enjoyed a production life of as little of two to three years such as the Sportman.


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