Hellenic Post (ELTA) has released a special set of four postage stamps featuring amateur radio in Greece

A post by the national amateur radio society of Greece (RAAG) says:

We would like to inform you that, on the occasion of the opening of the Radiocommunications Station of the General Secretariat for Telecommunications and Post of the Ministry of Digital Governance, the Hellenic Post will release a booklet of 4 Self-Adhesive Personal Stamps which will be available from Tuesday, February 15, 2022.

Five thousand (5,000) pieces will be produced.

See the RAAG post at
https://raag.org/radioerasitexnismos-ellada-stamps/