Stamp of USSR 2023 - postal stamp - PICRYL - Public Domain Media Search Engine Public Domain Search

File:Stamp of USSR 0972.jpg - Wikimedia Commons

Stamps of Germany (DDR) 1963, MiNr 0992 - PICRYL - Public Domain Media Search Engine Public Domain Search

Stamp Syria 1923 1.50pi on 30c - public domain postal stamp scan - PICRYL - Public Domain Media Search Engine Public Domain Search

Malta stamp 8 - PICRYL - Public Domain Media Search Engine Public Domain Search

The Soviet Union 1961 CPA 2623 stamp (22nd Congress of the Communist Party of the Soviet Union. Worker and slogan) - PICRYL - Public Domain Media Search Engine Public Domain Search

File:Stamp of USSR 1023.jpg - Wikimedia Commons

Mahatma Gandhi 1948-3 - postal stamp - PICRYL - Public Domain Media Search Engine Public Domain Search

St. Vincent Revenue Stamps - public domain postal stamp scan - PICRYL - Public Domain Media Search Engine Public Domain Search

File:Stamp Soviet Union 1988-1991 (13-th).jpg - Wikimedia Commons