Watch List notes:

Marcus Aurelius, as Caesar, BI Tetradrachm of Alexandria, Egypt. Dated RY 20 of Antoninus Pius = AD 156/7. Μ ΑVΡΗΛΙС ΚΑΙСΑΡ, bare-headed and cuirassed bust right, wearing paludamentum / Poseidon standing right, with foot on rock, holding trident and dolphin; L-K (date) across fields. RPC IV Online 16372 (temporary); Emmett 1858; Dattari (Savio) 3172. 11.48g, 23mm, 12h.

Very Fine. Extremely Rare; RPC Online cites only one example and no others on CoinArchives.