A Colonial-era silver bowl that was hidden in Boston before the Revolutionary War and then languished in England for 230 years sold last week for an astounding $5.9 million. The bowl had been owned by Joshua Loring, a Tory who fled Boston in 1774 when harassment by colonials became untenable. Weighing more than 4 pounds and measuring more than a foot in diameter, the brandywine bowl was estimated at $400,000 to $800,000.