2.85g
Obv: Bust of a gorgon facing
Rev: Anchor, "A" to left and crayfish to the right
BMC 160
The full weight drachm with Anchor obverse and Gorgon reverse (opposite of this type) have been extensively counterfeited. I recommend this site and links from it for and education on the drachms of A-P.
http://www.wildwinds.com/coins/greece/thrace/apollonia_pontika/i.html