Watch List notes:

ANCIENT COINS. BYZANTINE. Justinian I (A.D. 527-565), AE Follis, 21.68g, 7h. Fifth officina, dated R.Y. 12 (538/9). Armed and helmeted bust facing, holding a globus cruciger, cross in field on right. Rev. Large M surmounted by a cross, date at side, officina E below, CON in exergue (S 163). A well-struck example with an even brown patina, about extremely fine.
Ex Sternberg, Zürich, private treaty, c.1989

Estimate: $400