Beginning with WIP-6052, a new series of matrix numbers was introduced for 7" singles. Henceforward, singles' sides were not usually identified as "A" or "B", but each bore a unique matrix number in a series starting at wipx 1002. The matrix number appeared on the label, usually upside-down directly beneath the main catalogue number. The matrix numbers seem to have been allocated to each release in numerical sequence, irrespective of the actual or proposed release date of the record; thus the two sides of WIP-6056 (Jethro Tull's "Living In The Past" b/w "Driving Song") have matrix numbers wipx 1010 and wipx 1011, respectively. Initially, the new matrix numbers were used in conjunction with the existing "eye" label design, but beginning with releases in June 1969 a new pink label design was introduced, known as the "block" design. The new design continued to feature the "eye" device in plain black enclosed within the push-out centre of the record, but the company name was now written in capital letters within a rectangular black block in the lower part of the label. The first release to feature the new label design appears to have been WIP-6060 and the last to feature the orange-and-black "eye" design WIP-6061, a reissue of "Incense" by the Anglos, which had actually been released the previous month. One or two earlier releases which were evidently still selling were re-pressed with the new design (e.g. WIP-6056, which exists with both the orange-and-black "eye" and the "block" label designs).