Caligula AE22 of Byzantium, Thrace. AD 37-41. 3.9 g.

GAIOY KAISAROS GERMANIKOY, bare head left
BYZANTION, two fishes.

RPC I 1780; Varbanov 1621; Moushmov 3271; Schönert-Geiss 1309–1311. 
Rare.

With permission of Savoca Numismatik auction 4, Lot 339, Aug. 2015.
Later resold by Numismatik Naumann auction 39, Lot 478, Jan 2016.