Watch List notes:

Stato Pontificio, Sisto IV (1471-1484), Grosso, Viterbo, 1471-1484; AR (g 3,01; mm 24; h 12); SIXTVS PP - QVARTVS, coat surmonted by thiara and keys, Rv. S PAVLVS S PETRVS, S. Peter and S. Paulus. Muntoni 62; Biaggi 3013.
Of high rarity, old cabinet tone, good very fine.