Dated Roman Egypt Alexandria Marcus Aurelius billon tetradrachm coin, 11.49g.
In general Roman Alexandrian coins can not be linked to a specific event. This coin dated year ten was intended to commemorate the 10th year reign celebration for Marcus Aurelius.
Minted in the 10th (denoted by letter I) Alexandrian year of the Emperor = 169/170 CE.
Obverse: Laureate bust right.
Reverse: Wreath containing date: L I.
Reference: Emmett 2087/10.
Certified authentic by NGC to F, dark toned.