Watch List notes:

Augustus, with Gaius as Caesar, Æ 25mm of Alexandria, Egypt. 27 BC-AD 14. [ΣΕΒΑΣΤΟ]Σ, laureate head of Augustus to right; c/m: uncertain symbol(?) / ΓΑΙΟΣ [ΚΑΙ]ΣΑΡ, bare head of Gaius Caesar to right. RPC I 5019; Dattari (Savio) 1. 9.14g, 25mm, 12h.

Good Fine. Extremely Rare; the only example on CoinArchives and only six examples known to RPC online, four of which are in museum collections.

From the inventory of a UK dealer.