Gordian III, AE 37 mm Medallion of Perinthos, 37gm.

Obv: AVT K M ANT GORDIANOC AVG, laureate, draped, cuirassed bust right.
Rev: PERINQIWN IWNWN DIC NEWKOR, WN (in ex.), Serapis standing right, 
holding sceptre in left arm, wreath in right hand, facing Homonoia, 
standing left, holding wreath in which is a palm branch, burning altar 
between them. 

Schönert-Geiss 860; Moushmov 4693; Paris 1047.

Very rare.

Courtesy of Robert Perry (ebay themoth53), Oct. 2010.