Contact papers for these machines were available in rolls in a selection of grades of contrast. Finishers at the time believed that a wide variety of contrast grades was necessary to print the wide range of negative contrasts that were around. Most of these variations in contrast were due to inconsistent film processing methods by the finishers.
The Ilford Roll-Head Printer was still listed in the 1961 Ilford Professional Catalogue where it was priced at £120. By 1961 it would have been rather out of date.
I am grateful to Maurice Fisher and David Muggleton for the scan of a page in the Ilford 1955 catalogue that can be see by clicking here. By 1955 the machine is designated as Series 2.