The Centurion was launched in the UK in march 1999 (1st test market).
Then in the US (3rd quarter 1999) and Germany (1st quarter 2000).
There should be also an "International Dollar card" Centurion billed in US$ for customers living outside of the US.
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If Amex UK is now issuing Centurion cards for "new" customers, with little credit history, It's an interesting concept for an "elite" product....