Gemini, LLC - Auction VII, Lot 729.
Ended Jan. 9th 2011.

Divos Julius Caesar & Octavian, AE21, 12g Thessalonika, Macedonia. Year 4 = 28-27 BC.

QEOS, Wreathed head of Julius Caesar right
QESSALO-NIKEWN, bare head of Octavian right, delta beneath neck. 

RPC 1554; Varbanov 4151; Moushmov 6658; Sear GIC 151; BM 58; 
Touratsoglou, Thessaloniki, p. 143, no. 42 (V10/R39), pl. 1.