EAST DENNIS, MASS. — Nearly 1,000 lots went under Eldred’s gavel during the firm’s four-day Americana Week, July 22-25, which included three single owner collections: those of Martha Hamilton, Peter & Judi Hersey and Arun & Barbara Singh. Up first, on July 22, Martha Hamilton’s collection reached its apex at $239,400 when a private collector bidding by phone purchased Joseph Steward’s (1753-1822) portrait of Samuel Tracey Coit, painted circa 1790. Coit&rsqu