Gary Sullivan, left, a... Pictures

Gary Sullivan, left, a featured appraiser on PBS’s “Antiques Roadshow,” specializes in high-end, American antiques and clocks. Here he talks with a guest about an Isaac Jackson Tall Case Clock, circa 1760.  Photo courtesy of WGBH by Jeff Dunn
Gary Sullivan, left, a featured appraiser on PBS’s “Antiques Roadshow,” specializes in high-end, American antiques and clocks. Here he talks with a guest about an Isaac Jackson Tall Case Clock, circa 1760. Photo courtesy of WGBH by Jeff Dunn

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