As far as I know it wasn't launched commercially but occasionally Campagnolo do produce "specials" as demos for OEM. Could be it's one of those, or maybe someone dropped the roll-pins out of the parallelogram assembly (do-able with the right kit) and painted it AM.
As an example of a "special", I have a full prototype Potenza group, for instance, branded Athena, made before the name Potenza was settled on, used as a show-piece for potential OEMs.