6 countries - Austria - Germany - Liechtenstein - Luxembourg - the
Netherlands and Switzerland - issued a common "Multilaterale" folder
containing this year's Europa stamps from the six countries (10 stamps in total).
This folder can be ordered by any of the 6 postal administrations.
It is the sixth issue of this kind after : 2013 (theme - "The postman van") ; 2016 (theme - "Ecology in Europe - Think Green" ; 2017 (theme - Castles) ; 2018 (theme - Bridges) ; 2019 (theme - National birds) and 2020 (theme - Ancient postal routes)