Watch List notes:

BYZANTINE EMPIRE. Constans II. 641-668 AD. AV Solidus (4.54 gm; 20 mm). Constantinople mint. Struck 654-659 AD. Crowned busts of Constans and Constantine IV, on exergual line / Cross potent on steps; Z//CONOBI. DOC II 26f; SB 960. Sharply struck on a nice broad flan. Perfectly centered. Choice FDC. Lustrous.