50th Years of Soviet Inventions. (Soviet Union, USSR 1969)

20 June (Soviet Union, USSR ) within release 20th Anniversary of World Peace Movement. goes into circulation Stamp 50th Years of Soviet Inventions. face value 4 Russian kopek

Stamp 50th Years of Soviet Inventions. in catalogues
Michel:	Mi:SU 3637
Yvert et Tellier:	Yt:SU 3500

Stamp is vertical format.

Also in the issue 20th Anniversary of World Peace Movement.:

• Stamp - Centenary of Mendeleev's Periodic Law of Elements. face value 6;
• Stamp - 20th Anniversary of World Peace Movement. face value 10;
• Stamp - 50th Years of Soviet Inventions. face value 4;
• Souvenir Sheet - Block: Centenary of Mendeleev's Periodic Law of Elements. face value 30;