In 2023, PostEurop celebrated its 30th anniversary.
To mark the occasion, they produced an anniversary logo that was used by several postal administrations to produce a stamp issue.
These include Albania, Azerbaijan, Bulgaria, the Faroe Islands, Kazakhstan, Moldova and Serbia.
The Isle of Man added this logo on their 2023 Europa stamp issue and Poland & Romania have both issued a postal stationary.
I may be forgetting some ...