The North Borneo 1961 issue and subsequent overprints in 1964 has many variations and varieties that are not catalogued. Waterlow & Sons only did one printing run before the business was sold and eventually taken over by Thomas De La Rue in 1961. DLR did reprinting of the stamps in different tranches. There were differences when compared to the printing done by Waterlow especially in the perforation patterns. The main alteration being that the bottom margin of the printed sheet was left unperforated to the margin of the selvedge by Waterlow but perforated through at the top. The DLR printed sheets were directly the opposite in addition to other patterns of perforation as well as varying selvedge margins.
There were also slight differences in shade with some of the values. One of the varieties that has been recognised in recent years is that in some of the 10c stamps, presumably DLR reprints, has an imperfect right inner frame line as shown below.
