Translation of legend abbreviations:

A(VTOKPATΩP)   K(AICAP)  M(APKOC)   A(VPHΛIOC)   NOVEMPIANOC  K(AICAP)  C(EBACTOC)

Imperator Caesar Marcus Aurelius Numerianus Caesar Augustus

L B

year 2

EGYPT, Alexandria. Numerian

year 2, CE 283/4, as Caesar

potin tetradrachm, 19 mm, 7.16 gm

Obv:  AKMANOVMEPIANOCKC; laureate draped bust right

Rev:  Athena seated left on throne, holding Nike and spear

Ref: Emmett 4013(2-C), R4. Milne 4698

CNG e324, 9 April 2014, lot 707 (large lot of Alexandrian tetradrachms, many of which had been "treated" by a previous owner with what appeared to be women's makeup, mimcking a sandy patina.  Fortunately the makeup was easily removed and hopefully no harm done.