Watch List notes:

Marcian. A.D. 450-457. AE half centenionalis (10.9 mm, .87 g, 2 h). Cyzicus mint. D N MARCIANVS P F, diademed and draped bust of Marcian right, seen from behind / Monogram of Marcian (RIC monogram type 1) within wreath broken by cross at top; exergue off-flan [CVZ (< "backwards Z")]. RIC X 562 . VF, smooth green patina, well-struck for type.

Ex Leo Hamburger 1890's.

This coin comes from a large group of Roman Provincial, Byzantine and Vandalic coins which were part of Leopold Hamburger's inventory. More information on Mr. Hamburger can be found here:https://www.coinbooks.org/v20/esylum_v20n42a19.html