Ephesos in Ionia, Augustus, ca. 25 BC., countermarked in Macedonia?
Æ As (25 mm / 9,69 g),
Obv.: CAESAR , bare head of Augustus right, before countermark: ligate NK, in circular punch, 6.5 mm, (Howgego 625).
Rev.: AVGVSTVS , within laurel wreath.
RPC 2235 ; RIC 486 ; BMC 731 ; CBN 966 (Pergamon) ; CNR VI, 851 ff ; for countermark: , Howgego 625 (25 pcs).
The countermark usually is on coins of Macedonia and probably stands for Nero Kaisar (Caesar).