Greek city of Athens in Attica Greece Silver Tetradrachm 24 mm (16.86 grams) Struck circa 440-404 B. Certification: NGC Ancients AU Strike: 5/5 Surface: 4/5 4373042-006 Helmeted head of Athena facing right Owl standing right, head facing, crescent and olive sprig behind, all within incuse square. Provided with certificate of authenticity.CERTIFIED AUTHENTIC by Sergey Nechayev, PhD - Numismatic Expert. The item "ATHENS Attica Greece 440BC Ancient Greek Silver Tetradrachm OWL ATHENA NGC AU" is in sale since Thursday, November 15, 2018. This item is in the category "Coins & Paper Money\Coins\ Ancient\Greek (450 BC-100 AD)". The seller is "victoram" and is located in Forest Hills, New York. This item can be shipped worldwide.