*Just several specimens recorded by acsearch, Berk knew of only 2 examples*
Constantine IV Pogonatus (668-685) AE Decanummium (Bronze, 3.46g, 22mm) Constantinople, ca 674-685.
Obv: Helmeted and cuirassed bust facing slightly right, holding spear over shoulder, shield on left shoulder
Rev: Large I; cross set on step to left, K to right.
Ref: DOC –; MIB 92 = Berk, Eastern 728; Sear 1183B.