612-616 AD., Heraclius and Heraclius Constantine, Constantinopolis mint, Follis, countermarked between 633 and 636 in Palestine, Sear BC 805 var.

Heraclius (610-641 AD.), and Heraclius Constantine(613-641. AD.), Constantinopolis mint, officina 1, struck ca. 612-616 AD., countermarked between 633 and 636 in Palestine,
Æ Follis (24-26 mm / 5,66 g), bronze, axes about coin alignment ↑↓ (ca. 190°),
Obv.: [dd NN hERACLIuS Et hERA CONSt PP A] , (or similar), Heraclius in chlamys [holding long cross on left], Heraclius Constantine in chlamys holding globus cruciger on right, cross between heads.
Rev.: large M (value mark 40 nummi), chi rho Christogram above, [A / N] / N / O left, uncertain regnal year on right, A below (1st officina), mint mark CO[N] in exergue; oval countermark Heraclius monogram {hRAcΛ..} (Sear no. 34) to right.
Sear BC 805 var. (countermark) .

Wolfgang Schulze, Countermarking in Seventh Century Syria: Countermarks with the monogram of the Emperor Heraclius (610–41) are found in Syria on Byzantine copper coins. After discussing the typology and the reading of the countermarks we reject the older proposals that the countermarks served as a kind of revaluation in connection with the Heraclian monetary reforms. Statistical analyses of 173 specimens and their provenances, as well as comparisons with contemporary finds, have led us to the conclusion that the countermarks were applied between c. 633 and 636 in Palestine I. They were presumably produced during the struggles with the invading Arabs. Circulating copper coins (old and new — folles, three-quarter and half folles) became revalued by countermarking because of the serious lack of cash at that time in Syria.