I think Cinelli probably has one remaining polished silver Athena 11-speed group they swap from frame to frame every time they renew/extend Supercorsa production.

That groupset hasn’t appeared in the catalogue for almost ten years, and I doubt has been produced for even longer. Centaur, the pseudo-silver photocopy of a photocopy of a polished silver groupset, battled along a little longer and bits and pieces still surface from time to time.

As and when the Supercorsa reappears for sale I’d bet good money it’ll be offered as a frame only, or at most with a modern, non-silver groupset build.