Istros Thrace - Obol 400-350 BC

   .82g,11mm in diameter

Obv: Two facing busts, one inverted

Rev: Sea eagle on the back of a dolphin "ISTRIH" above, monogram below

SG 1670v

This tiny issue and other Istros fractions were sometimes imitated by the local Celtic people.  The somewhat crude style of this coin tells me that it may be a contemporary imitation.