Twice a week for three consecutive weeks this summer, M&T Bank mailed crisp $1 bills to 500 potential customers. Until the very end, the bank never identified itself.

The Buffalo-based bank used the six-part teaser campaign to build awareness of its corporate trust division. The first five mailings, sporting the lines "Another day, another dollar -- but not just another bank," contained a buck and a flattering statistic about the financial strength of an unidentified institution.

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