The first digit is indicative of the number of pieces contained in one sale unit (FIRST PACKING - SO, CE, CP etc.), while the second digit is indicative of the number of pieces contained in the master carton.
Piacenza Jugs packed in a brown box with cardboard dividersSleeve of 3 Jazz Water glasses in a master carton of 36 glasses1 Palladio Bowl 21,5 in a gift box, in a master carton of 6 bowls