TRENTON, N.J. - An anonymous buyer has paid more than $30 million for a collection of rare U.S. prototype coins, some from the 1700s, that never went into circulation, according to the dealer that brokered the deal. ADVERTISEMENT The collection consists of about 1,000 coins that collectors refer to as pattern coins — trial designs that never went into production because the U.S. Mint chose other designs. "This collection is an incredible collection. ... These were some of the first coins ever, ever struck by the United States government," said Laura Sperber, a partner in Legend Numismatics of Lincroft, N.J.,...