By the Numbers no. 1—second addendum: Mantova
In searching through my archive of Legacy of Letters photographs I found this wonderful example of a didone address in Mantova with the old house number carved beautifully in stone—the 5 is especially charming—and a newer house number in enamel. The numerals of the latter are condensed. The 3 is notable for its horizontal top.

House number in Mantova. Photograph by Alta Price (2011).