Gergis, Troas, AR Hemiobol, 8 mm, 0.47 g. 350-300 BC. 

Laureate head of Sibyl Herophile facing slightly right.
GER, Sphinx sitting right. 

BMC 1; Weber 5374. 

With permission of Numismatik Naumann, auction 54, lot 141, June 2017.