Butterfield Bank dropped one cent (.86 percent) yesterday on the Bermuda Stock Exchange with 10,100 shares trading to close at $1.14.BF&M traded 1,700 shares and KeyTech traded 1,439 shares, both with no change in share price.Overall, the BSX dipped 4.74 points (.45 percent) to close at 1,043.90, with 13,239 shares trading worth BD$45,052.95.