Abstract: A process for printing a successive row of numbers of bar code 2/5 interleaved provides that the narrow bar/wide bar printing ratio is set at 2:1. A code field is divided into narrow bar areas and the latter are in each case assigned alternately to two different printing units. The printing units exhibit, in the bar areas assigned to them, adjustable printing forms in all bar combinations. The code is printed in exact register by the two printing units in succession.