 The old emblem of the municipality is formed by a crenellated tower, topped by a crown (gold on blue) with the motto "Virtus addidit".It incorporates the coat of arms of the Asinari family, lords of San Marzano between the thirteenth and seventeenth centuries.Cited by Alfieri as "San Marzano of Acquosana", the first documents that mention the castle date from the birth of the Contado of Acquosana - the ancient territory of Acqui Terme.