I have one too.
Mine is attributed to Ainos.
Kingdom of Thrace, Lysimachos, Silver tetradrachm
Obv:â€" Diademed head of the deified Alexander right, with horn of Ammon.
Rev:â€" BAΣIΛEΩΣ ΛYΣMAXOY, Athena seated left, holding Nike in extended right hand, left arm resting on shield, spear behind, monogram in inner left field, monogram under Throne
Ainos mint. Posthumous issue struck after 281 B.C.
Reference:- Thompson -, Muller -.
Allocated to Ainos thanks to Barry Murphy who stated "Not the same dies or the same monograms, but clearly the same engraver as Meydicikkale 2691".

Martin