From the Eukratides Ancient Numismatics vcoins store:
http://www.vcoins.com/ancient/eukratides/store/dynamicIndex.asp
 	

Syria, Seleucid Kings. Seleukos I Nikator, with Antiochos I Soter. 312-281 BC. AR Drachm (3.17 g, 18 mm). Aļ Khanoum mint. Struck circa 285-281 BC. Laureate head of Zeus right / Athena Promachos in elephant biga right; monogram above elephants. SC 282.1;  A very rare example struck in BOTH the names of Seleukos and Antiochos. Broad oval flan which is darkly toned.

	
Price
  US$ 475.00 	 euro 375.77
 £ 258.69
 AUD$ 629.87
 CHF 587.12
 CAD$ 535.52
Rates for 7/14/2006