A William and Mary-era harpsicord? One of the printed maps that figured promiently in Vermeer's Lutenist? An 18th-century bed-curtain tie-up? Or a pewter nautilus cup redolent of a Golden Age still-life? All these and more may be available in Amsterdam's famous array of antiques stores, the Spiegelkwartier, or Spiegel Quarter, centered around Nieuwe Spiegelstraat and its continuation, Spiegelgracht. But this section -- with shops on both sides of the street and canal for five blocks, from the Golden Bend of the Herengracht nearly to the Rijksmuseum -- often requires a House of Orange budget.