Cinelli made an unknown number of frames to be used specifically with the Altenburger derailleur system; more information here and here about it. Photos of such a bicycle, and with matching fenders (click on photos to enlarge):
Reminder: I invite you to contribute by sending in photographs of your Cinelli bike, illustrations, personal stories, and articles about Cinelli bikes and components. I can be contacted at firstname.lastname@example.org
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