The identification of the heads is extremely difficult. BMC, following Mi 3.307.21, identified the obv. as Augustus and Livia, and the rev. as Gaius and Lucius Caesar facing their natural father Agrippa; this was followed by Imhoof-Blumer (on his ticket under the coin in B). The portraits are not at all diagnostic; indeed, if anything, they look Severan! On the other hand, the letter form Σ indicates an early date. There is no obvious interpretation to offer; but for the obv. legend one might have suspected that Apollo and/or Artemis were represented, as on the similar piece of Claudius (2819). Compare the similarly puzzling coin of Methymna (2339). See K.-L. Elvers, Plena Caesarum domus. Überlegungen zu einer frühkaiserzeitlichen Bronzemünze aus Alabanda (RPC I, 2816), in H. Schwarzer and H.-H. Nieswandt (ed.), Festschrift für Dieter Salzmann zum 65. Geburtstag, I (Marsberg/ Padberg, 2016), pp. 61-71 and Tafel 6.