Leo I, AE11 of Constantinople, AD 457-474. 1.5 g

DN LEONS PF AVG (with L or Greek Lambda), pearl diademed, draped, cuirassed bust right.
Leo's Latin monogram. 

Mintmark CON. 

RIC X 686 or 687 (depending on the form of the L on the obverse; Sear 21443. 

Contributed by Mike Pennington, Jan. 2016.