Wikimedi'Òc

1994-europa-lithuania-Mi555.jpg - Arz

Stamps of Tajikistan, 031-03.jpg - Cekli829

Stamps of Uzbekistan, 2011-38.jpg - Cekli829

Briefmarke-Kim-Bong-Han.png - Redlinux

Progress in Electronics 6c 1973 issue U.S. stamp.jpg - MrFrosty2

Progress in Electronics 15c 1973 issue U.S. stamp.jpg - MrFrosty2

Russia stamp 1998 № 473.jpg - Engelberthumperdink

Vityaz-D 2021 stamp of Russia.jpg - Materialscientist

TSIKLON 2021 stamp of Russia.jpg - Materialscientist

Stamp of Indonesia - 2017 - Colnect 929993 - Maritime Ports.jpeg - Gone Postal

Stamp of Tajikistan - 2003 - Colnect 421587 - Aviation.jpeg - Gone Postal

Stamp of Tajikistan - 2013 - Colnect 446520 - 20th Anniversary of Academy of Science of Tajikistan.jpeg - Gone Postal