Caligula AE20 of Philadelphia, Lydia. Magistrate Zenon 
Philokaisar. 3.68g. 

GAIOC KAICAR, bare head right, lituus before. 
FILADELFEWN ZHNWN A, above and beneath winged thunderbolt. 

RPC 3026 var. (magistrate). Apparently unpublished.

Courtesy of Ancient Resource on vcoins.com, item. PM1352.