Leo I (Augustus in the East 457-474 A.D.) -  AE4 - 11.35mm, 0.82gr
Obverse - DN L-EO
Leo, his pearl diademed, draped and cuirassed bust right.
Reverse - No legend,
CON in Exergue.
Lion crouching left, head right, within wreath (broken by mint-mark)
The image below was photographed by Rasiel Suarez from dirtyoldcoins.com. The image above is my own scan.

Minted in Constantinopolis between February 7, 457 and January 18, 474 A.D.
Reference:
Kent, J.P.C., "Roman Imperial Coinage", Volume 10 (RIC), p293, nr 676, obverse L20/D3
Sear, David R., "Roman Coins and their Values" (RCV 4th Revised Edition), p369, nr. 4341, variety
Carson, R.A.G., Hill, P.V., & Kent, J.P.C., "Late Roman Bronze Coinage",  Part II, p91, .nr 2260, variety
Van Meter, D., "Handbook of Roman Imperial Coins", p329, nr 16, variety
Quality: ???