ITALY. Papal States. Calistus III (Alfonso Borgia), 1455-1458. Grosso (Silver, 26.5 mm, 3.77 g, 7 h), Rome. º+ºCALISTVS✿º - ºP Pº TERTIVSº Tiara and crossed keys over shield bearing the Borgia arms; all within quatrefoil. Rev. ºS ºPETRVS ºS º PAVLVSº ºALII-Aº ROIIA Sts. Peter and Paul standing facing. Berman 351. Muntoni 10. Rare. Attractively toned and well-struck. Minor die fault on the reverse, otherwise, about extremely fine.
From the Dr. Pelc Dens Sapientiae Collection, ex Münzen & Medaillen (DE) 26, 27 May 2008, 45.