It is decorated in the cavetto by a pinwheel of petals that surrounds an oak leaf with a symbolic value (strength, family), while geometric motifs alternating with the trellis decorate the brim. On the external surface there are vertical bands highlighted by strokes of color. It presents the peculiar characteristics of the archaic Po Valley graffito ceramics that originates in the Lombard and Emilian area productions. The shape and the decorative motif are compared with the ceramics produced by the factories of the Piedmontese localities of Alessandria and Tortonese under the dominion of the Visconti, but some characteristics, in particular the vertical bands graphed on the external surface, indicate their local production by of potters arrived in Vercelli and attested by written documents especially after the mid-fourteenth century.