c. 1973, Europa CEPT issue
The design that year, a stylised post horn, was made by the Norwegian artist Leif Frimann Anisdahl (24 countries; 50 stamps). The 3 arrows are said to represent CEPT’s primary objectives: post, telegraph and telephone services — Europa-Stamps blog
Note that the umlaut in Fürstentum [Principality] has been replaced with UE. Even if the character set of Churchward Design were lacking umlauts, it would have been easy for the designer to add a pair of dots. I assume this was done to get a compact and even block of all-caps, with no protruding bits.
Contributed by Letters from Sweden
Photo(s) by “Buro Destruct” on Flickr.
Contributed by Stephen Coles
Contributed by Florian Hardwig
Contributed by Font Bureau
Contributed by Shiva Nallaperumal