POST Greenland, Filatelia collaborates internationally on a number of stamp issues.
The Nordic countries
This joint Nordic stamp issue has the title ”Top of the World of Stamps”, which is issued every other year.
PostEurop is an organisation for the public post services in Europe.
The organisation is behind a joint yearly EUROPA-issue.
SEPAC is short for Small European Postal Administration Cooperation. Three joint issues issued every other year are planned. The theme for the issues is landscapes and locale issues.