Abstract: A multicolor offset perfecting press comprising a printing station having offset cylinders, plate cylinders in contact and operatively associated with the offset cylinders, and compression cylinders and at least one intermediate cylinder both having their diameters threefold larger than those of the offset cylinders. The printing station comprises at least a pair of back side printing units and at least a pair of top side printing units arranged to be successively in contact and operatively associated together. Each of the back side printing units is adapted to be horizontally in contact and operatively associated, on one side, with one of the compression cylinders and in contact and operatively associated, on the other side, with vertically paired offset cylinders.