Watch List notes:

Constans II, with Constantine IV, 641-668. Solidus (Gold, 19 mm, 4.25 g, 7 h), Constantinople, Z = 7th officina, 654-659. d N CONStANtINUS C CONStANS Crowned and draped facing busts of Constans, with a long beard and Constantine, beardless and much smaller; between them above, cross. Rev. VICTORIA AVGЧ Z / CONOB Cross potent set on base and three steps. DOC 25i. MIB 26. SB 959. Sharp, lustrous and clear. Extremely fine.

From a Swiss collection.