Heraclius. AE Decanummium, Rome or Ravenna mint. 11mm, 1.53 g. AD 610-641. 

DN ERACLI PP A, crowned and draped bust facing, holding cross on globe.
Large X. No fieldmarks or mintmark.

SB 893; DOC 269 and 284; Hahn MIB 247. 

Very rare. 

With permission of cngcoins.com, auction 93, Lot 1355, May 2013.