The 1c Brown Northern Lights and Dogsled Stamp of the 1967-1973 Centennial Issue - Part Two
Today, I delve into the PVA gum printings of the 1c Northern Lights and Dogsled sheet stamps. According to Unitrade, the first time these appeared was in November 1971, with the general tagged stamps, and then in December 1971, the untagged sheet stamps were issued. Finally, in January 1972, the stamps with Winnipeg centre bar tagging were issued. This all raises a few questions, which may never be adequately answered: Why were the Winnipeg Tagged stamps issued at all, when the general tagged stamps were already available 2 months before? Why are there no OP-4 tagged stamps? All the GT-2 stamps seem to be OP-2, yet the general consensus among specialists is that OP-4 taggant was used first and abandoned when it became clear that it was unstable. Yet the lack of OP-4 stamps on this issue suggests that the situation may have been more complicated than this. The answer to the first question may be that the equipment in operation in Winnipeg was still the old Sefcan m...