Can recent Groenland issues similar to Denmark stamps be considered as joint issues ?
No, not really. Recent colonial or territorial issues with the same design issued at the same date could be considered as sub groups of twin issues and could be named colonial or territorial twin issues. However, as only one country decides for issuing both stamps, they cannot be considered as true joint issues. Again, these issues are reported in the catalogue, without details but with the mention “Territorial” or “Colonial”. Recent countries involved in such issues are for example Denmark with Groenland, Portugal with the Acores and Madeira, the Netherlands with Aruba and the Dutch Antillas. The case of Australia and Christmas Islands was reconsidered as well.
