Watch List notes:

Constans II. 641-668. AE follis (20.8 mm, 4.55 g, 7 h). Constantinople mint., dated A.D. 542/3. ЄN TV[TO NI]KA, Constans, beardless, standing facing,; wearing crown and chlamys, holding long cross and globus cruciger / Large m; to left and right, A / N / A ? N / E / O / ς; in ex, B II; ( = yr. 2 = 642/3 ). SBCV 1000; DOC 60; . Good VF for type, brown patina, desert patina reverse.

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