A year after introducing its Signature card for the affluent market, Visa U.S.A. is calling it "one of the fastest-growing premium credit cards ever," with 500,000 in circulation.

Visa Signature comes with travel benefits and customer service perks. Issuers include Merrill Lynch & Co., Associates First Capital Corp., Capital One Financial Corp., Citigroup, and the First USA division of Bank One Corp.

"When we launched Visa Signature, there were more than nine million households in the United States with annual incomes exceeding $100,000 -- and an additional 62 millionaires have been created every day over the past year," said Jeff Kann, executive vice president of consumer credit products for Visa U.S.A. "Visa Signature has provided issuers with a tremendous opportunity to tap into this growing affluent segment by offering valued services and features beyond traditional payment."

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