Part 1 of 2 in Washington, D.C., features a 1958 letter from Martin Luther King Jr.; a circa 1965 Andy Warhol lithograph; and a turn-of-the-20th-century, hand-wrought Gorham silver tea set that's valued at $90,000. Also: the Harry S. Truman Building.
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Ready to Watch Antiques Roadshow US, Season 15, Episode 16?