What species of bird is on this coin?
It said to be an eagle.  

It looks like a Ptolemy V (204–181 BC): 

http://www.bonanza.com/listings/-DD-G-068-Ptolomy-V-Octadrachm-COPY/16293418?gpid=21297750541&amp;gpkwd=&amp;goog_pla=1&amp;gclid=CMWBpbOaxrUCFYx_Qgod6TsA9w

it looks to be a pretty standard motif of that era:  



From: http://www.worthpoint.com/worthopedia/alexander-iii-great-336bc-greek-coin-150614256

I agree that this is not really a biology question.. but what the hey.