Watch List notes:

Constans II (641-668), solidus, Constantinople, facing busts of Constans II and Constantine IV, between their heads cross, rev., cross potent on three steps; officina Θ; in ex., CONOB, 4,45g (DO 25; S. 959; MIB 26), minor reverse mark, otherwise virtually mint state Ex European Ambassador Collection, formed in the 1950s and 1960s.

Estimate: 400 - 500 GBP