Julius Caesar - AE Caesar with octavian (F12)

Octavian and Divus Julius Caesar. AE 23, 8,01 gr. (h). Thessalonica, Macedonia, Year 4 = 28-27 BC. Obv: Wreathed head of Julius Caesar right, ΘEOΣ downward before neck. Rx: Bare head of Octavian right, Δ below neck, ΘEΣΣA - ΛONIKEΩN downward on left and upward on right. RPC 1554. BM 58. Varbanov 5153. Touratsoglou, Thessaloniki, p. 143, no. 42 (V10/R39), pl. 1. VF.
RPC, following Touratsoglou, interprets the Δ on obverse as a date, Year Four of an era presumably beginning with Octavian's victory at Actium. Thessalonica is known to have had a temple of Divus Julius, perhaps explaining the city's use of Caesar's portrait as a coin type under Augustus (Touratsoglou, p. 25, note 2) .