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http://archaeologyinbulgaria.com/2014/09/10/oldest-coin-in-bulgaria-2650-year-old-electrum-coin-from-ancient-lydia-found-on-black-sea-coast-at-sozopol/
Oldest Coin in Bulgaria, 2,650-Year-Old Electrum Coin from Ancient Lydia, Found on Black Sea Coast at Sozopol