Watch List notes:

Stato Pontificio, Gregorio XV (1621-1623), Mezzo Grosso, Roma, 1621-1623; AR (g 1,38; mm 20; h 9); GREGORIV S XV PONT M, coat, Rv. SVB TVVM PRÆSIDIVM, lthe Holy Virgin. CNI 128; Muntoni 24; Berman 1654.
Very fine.