Postcrossing is an international project whose aim is the communication of people from different countries, regardless of their location, age, gender and nationality, through postcards sent by the public postal service.
The stamp shows a postcard with the inscription: "I ♥ postcrossing". In the background, around the green circle the world-famous architectural buildings: St. Basil's Cathedral, Eiffel tower, arc de Triomphe, etc.
the Source:rusmarka.ru