Mario di Giampaolo has, on the basis of a photograph, kindly confirmed the attribution. Comparable drawings of friezes by Campi are at Christ Church, Oxford (J. Byam Shaw, Drawings by Old Masters at Christ Church, Oxford, Oxford, 1976, I, no.1110, II, pl.672) and at Florence (no. 1639 E., A. Petrioli Tofani, Inventario 2, Disegni esposti, Florence, 1988, p.676)