Constantine IV Pogonatus, with Heraclius and Tiberius, 668-685. Hexagram (Silver, 20 mm, 5.71 g, 6 h), Constantinople, 674-681. d N COIANЧS P Helmeted and cuirassed bust of Constantine facing slightly to right, with short beard, holding spear over shoulder in right hand and shield with left; helmet with frontal plume. Rev. Blundered legend Cross potent on globe and three steps flanked by Heraclius and Tiberius, both wearing crown and chlamys, and holding globus cruciger. DOC 25. MIB 67. SB 1170. Toned. Very fine.
From the Trausnitz Collection, ex Gorny & Mosch 134, 11 October 2004, 3238.

The hexagram was a short-lived large silver denomination that was produced in relatively large numbers under Heraclius, Constans II and Constantine IV. During the first reign of Justinian II limited numbers were produced but after that point the coin was only minted in extremely small numbers for ceremonial occasions.