Scott No.: 1560
Date of Issue: August 8, 1968
Set: International Geological Congress
Scott No.: 1703
Date of Issue: September 23, 1970
According to the Scott catalog, this stamp depicts the "Black Sun" and "Green Frog" house signs and the New Town Hall in Prague.
Scott No.: 1769
Date of Issue: September 10, 1971
The painting is "Tiger and Other Animals" by Minko Hanak (1921-1971). The two other stamps in the set feature works by Eva Bednarova ("Chinese Fairytale") and Yasuo Segawa ("The Miraculous Bamboo Shoot"). The set was released for a biennial exhibition of children's book illustrations.
Scott No.: 2250
Date of Issue: April 2, 1979
This stamp, "Frog and Goat," was issued to commemorate the 7th biennial exhibition of children's book illustrations. The International Year of the Child emblem is in the lower right corner.
Scott No.: 2457
Date of Issue: April 28, 1983
Species: European Green Frog (Rana esculenta)
Set: Protected Species
See also: First Day Covers
Scott No.: 2748-9
Date of Issue: July 18, 1989
Species: Fire-Bellied Toad (Bombina bombina), Yellow-Bellied Toad (Bombina variegata)
See also: First Day Covers, Maximum cards
Scott No.: 2834
Date of Issue: September 2, 1991
Subject: The Grimm Brothers' "The Frog King"