DALLAS, TX.- A silver decadrachm of Athens struck 2,500 years ago, a silver tetradrachm of Naxos in Sicily struck circa 430 BC and a remarkable offering of Roman gold coins – spanning the history of the Empire – highlight the first joint auction held by Heritage Auctions and Gemini Numismatic Auctions, slated for April 14, 2011 during the Chicago International Coin Fair (CICF). The joint Heritage-Gemini auction will include more than 552 Greek, Roman, Byzantine and medieval coins with individual estimates ranging from $500 to $875,000 and a cumulative estimated value of more than $3.5 million. “We’re more than pleased to be conducting a joint auction with Heritage,” said Harlan J. Berk of Chicago, president and co-founder of Gemini Auctions, along with B&H Kreindler of New York. “Herb and I have been friends with Heritage Co-Founders Steve Ivy an