CNG Auction #7
  Web Product ID: 559
  Estimate: $150.00
  Final Sale Price: $148.50
  Denomination: Drachm
  Grade: Good VF light toning
  Reference: Pick 432

Moesia, Istros. Circa 4th Century BC. AR Drachm (5.64 gm). Two male heads facing, the
  right inverted / Sea eagle carrying dolphin left; D behind, – below. SNG BMC Black
  Sea--; Pick 432. Good VF, light toning, attractive portraits. Estimate $150.
Although numismatists have put forth many theories to explain the curious obverse
  type of the Istrian coins with the two heads tęte-bęche, the most plausible
  explanation is that the design represents the two branches of the Danube River.


Used by permission of CNG, www.historicalcoins.com