Watch List notes:

ITALY. Papal States. Sixtus IV (Francesco della Rovere), 1471-1484. Grosso (Silver, 28.5 mm, 3.80 g, 10 h), Rome. •º SIXTVS • PP ❉ • - • ❉ QVARTVS º• Tiara and crossed keys over shield bearing the della Rovere arms; all within quatrefoil. Rev. º•S•º - ºPETRVSº:• - •ºROMAº• - ºS• PAVLVSº Sts. Peter and Paul standing facing; at their feet between them, ❉. Berman 452. Muntoni 18. Attractive, lightly toned and clearly struck. Nearly extremely fine.
From the Dr. Pelc Dens Sapientiae Collection, ex Classical Numismatic Group 61, 25 September 2002, 2481 and the C. Crippa FPL of April 1969, 582.