Antoninus Pius, 138-161. AE47 medallion. ca. AD 147-148. 68.76 g. 

ANTONINVS AVG PIVS P P TR P XI COS IIII, laureate head right.
No legend, Apollo, naked to waist, seated left on tripod or 
bench, in pensive attitude, feet not touching ground, 
holding branch and leaning on lyre; behind him, a female 
statuette standing left on a column.

Apparently unique and unrecorded.
With permission of Numismatica Ars Classica, May 2004.
Auction 27, 402 
Sold for 37,500 SFr (approx. $29,020 on auction date)