Constantine V, Syracuse half follis, Grierson 753 (called a 3/4 follis) or Sear 1569A, both listed as extremely rare. This example is approximately 15 to 15.5mm in size and weighs 1.8g.
Obverse: No inscription. Two busts facing, Constantine V on l., bearded, Leo IV on r., beardless, each wearing chlamys and crown without cross. Beneath horizontal line CIK� [Lambda] (?)
Reverse: No inscription. Bust of Leo III facing, bearded, wearing loros and crown, holding in r. hand cross potent on base. Beneath horizontal line, Lambda