Tiberius, AE25 of Seleukeia, Syria. 14.41 g. Dated RY 3 and Actian Year 47 (AD 16). Magistrate Q. Caeculius Metellus Creticus Silanus. 

SEBASTOS SEBASTOY KAISAR, Bare head right
G EPI SI-LANOY-ANTIO-XEWN ZM in seven lines within laurel-wreath.

RPC 4330; SNG Cop 402; BMC 33-34.  

This coin bears a double date on the reverse; the letter G 
refers to the third regnal year of Tiberius, i.e. AD 16/17; 
the letters ZM refer to year 47 of the Actian era, i.e. also AD 16/17. 

With permission of cngcoins.com, auction 203, Lot 400, Jan 2009