The Amex Centurion card, known as the Black Card is issued by invitation only; for that invitation to arrive in the mail, you need to be spending at least $21,000 per month on credit - oh, that's gotta hurt. According to the advertising, current cards are manufactured from anodised titanium. This laser etched card is targeting seriously affluent clients as you need up to a $5000 nomination fee plus a $2500 annual fee - that's pretty exclusive. I had a standard green Amex card before updating…