Abstract: This invention relates to numbering assembly incorporated into a conventional press of the offset type, which may selectively be rendered inoperative if numbering is not desired or printing is stopped, and which is automatically deactuated during the operation of the offset press if no printed material is discharged to avoid movement or change of numbers on the register in the absence of printed material on which a number is to be printed. The numbering assembly according to the invention, advantageously comprises an improved control assembly including a first electrical circuit comprising detection means responsive to the presence and absence of gripped material, a first normally open switch and a relay connected in series.