Demetrios II, Baktrian Kingdom, ca 175-170 BC. AR Drachm, 3.97 gr. 

Diademed and draped bust right
BASILEWS DHMHTRIOY, Athena standing facing, holding shield 
and spear; monogram at inner left. 

Bopearachchi 2A; MIG type 102.
Extremely rare, perhaps the third known. 

Used with permission of CNG coins, www.cngcoins.com, Sept, 2010. Sold for $1200.