“Rare air”…… https://www.ferrarichat.com/forum/threads/car-spotting-550-in-bianco.629849/page-2#post-147630511
For the 456M, it is rare indeed. I only track M's in the US, and there was only one Bianco Avus car in 2001. Laserguru is starting to track the earlier 456's, he may know if there are more.