Abstract: An offset printing press includes a blanket cylinder defining a first cylindrical surface having a radius r.sub.1 and a recessed section. A blanket is tightly stretched around the blanket cylinder and defines a second cylindrical surface having a radius r.sub.2 greater than r.sub.1. An impression cylinder is aligned with the blanket cylinder to define a printing interface between the blanket cylinder and the impression cylinder to receive paper sheets and to transfer an inked image from the blanket to the paper sheets. Drive means defines and maintains a fixed phase angle between the blanket cylinder and the immpression cylinder and rotates both cylinders at an equal angular velocity and in complementary directions to transfer images to the paper sheets. The number imprinting apparatus interfaces with the offset printing press and includes a number head having a body and a number imprinting surface.