The stamps were printed in landscape format by Harrison & Sons in England in two panes of 100, 10 x 10, with the cylinder numbers appearing on the right of the bottom margins, one for each colour, the left pane being numbered 1A and the right pane numbered 1B. There were two types of gum in use, Gum Arabic and PVA, the differences are clear to see, Gum Arabic being glossy and PVA matt. The colours were not produced by the standard four colour lithography method, cyan, yellow, magenta and black, but had dedicated colours as required by each value printed in photogravure. The left of the bottom margin contained colour check blocks, one for each colour surrounded by a black box, this black being for the State customisation black cylinder. The first issues were on paper watermarked 'Multiple SPM' upright and comb perforated 14 1/2. A few values appeared later on with watermark sideways and then later again without watermark.