Leo IV the Khazar, with Constantine VI, 775-780. Miliaresion (Silver, 23 mm, 1.43 g, 12 h), Constantinopolis. [ҺISUS] XRISTUS ҺICA Cross potent on base and three steps. Rev. LЄOҺ / S COҺS[T] / AҺT[IҺЄ Є] / C ΘЄ[U ЬA] / SI[LIS] in five lines. DOC 3. SB 1585. Rare. Clear traces of overstriking, otherwise, very fine.
This coin was overstruck on an Umayyad dirhem, with considerable parts of the undertype still visible. A number of such overstrikes have turned up over the years, mostly from emperors such as Constantine V and VI