Haverly's United Mastodon Minstrels was a blackface minstrel troupe created in 1877, when J. H. Haverly merged four of the companies he owned and managed.
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Borrowing techniques from showmen like P. T. Barnum, Haverly advertised the Mastodons in broadsides, newspapers, and playbills: "FORTY—COUNT 'EM—40—FORTY—HAVERLY'S UNITED MASTODON MINSTRELS".
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Meanwhile, Haverly entered the market of black minstrelsy and bought Charles Callender's Original Georgia Minstrels in 1878, renaming them Haverly's Colored Minstrels.