Close-up of Cylinder Numbers, almost hidden in the background printing. Just visible above the 'Oth' is the number for the gold base cylinder, followed by the gold overlay. The phosphor cylinder may be next, or it may be a space - certainly the gap between the two golds and the yellow is larger than one would expect for a single cylinder number. To the right of the yellow are magenta, cyan, black and grey.
This is not regarded as a new stamp issue by Royal Mail so there are no First Day Covers. Special postmarks are shown on our retail booklets webpage.