Or is this some urban myth?
Yes, the American Express Centurion (Black) card still exists. New card approvals have been severely restricted though.
Supposedly it was an urban legend many years back about its existence. The idea of the card was supposedly created around the urban legend (unless that is another urban legend )
Supposedly one of the forum members had one, however this was not confirmed and he left the forum after many member got suspicious.
the technical name for this card is Centurion
It does exist. Around 6 years ago I used to work in an upscale restaurant in Miami and we received many of those cards.
It definitely does exist. I swiped one at my place of work not too long ago.
Yep, my boss has one! He says he pays $2,500 in AF and, according to him, you need to have a financial portfolio of at least 1 million dollars in order to "qualify".
If you get an AMEX through USAA the card is black. I've had a couple of people look a little closer at it, and I have done nothing to discourage the assumption that I am a "Black" card holder :-P