Byzantine gold Nomisma Histamenon (Solidus)!
This gold coin is from the reign of Basil II. Basil was Byzantine Emperor from 976 - 1028 AD, almost 50 years! Approximate dimensions of coin are (25mm - 4.1g).
Obverse: Bust of Christ facing. Left hand on book of Gospels.
Reverse: Facing likeness of Basil & his younger brother (and succesor) Constantine VIII, with scepter between them.
Graded Choice Extra Fine by NGC with Strike and Surface rating both 4/5.