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Obtained at a public autograph signing at AJ Sportsworld in Toronto, Canada (Oct. 2012).
After the NY Rangers won the Stanley Cup in 1994 Brian received a congratulatory phone call from President Bill Clinton. "Was that Dana Carvey?", asked Brian, jokingly, after Clinton hung up. (He incorrectly recalled Carvey portraying Clinton on Saturday Night Live; in fact, it was the late Phil Hartman who portrayed Clinton.)
Hence the inscription on the side of that ball.