This FDC was issued in 2003 featuring Siamese fighting fish (Betta splendens) which is a popular species of freshwater aquarium fish.
The additional two Letter A stamps were issued in the 2010 Čtyřlístek Comics series showing Fifinka the Missy Dog and Myšpulín the Cat.
Fifinka the Missy Dog is the only 'girl' of the four characters of the cult comics series Čtyřlístek (Four-Leaf Clover in English) designed and created by illustrator Jaroslav Němeček. The good housewife Fifinka is reading a cookbook, with a cup of white coffee and a cake on the table before her. The Čtyřlístek stories have been published for an unbelievable more than 40 years. The adventures of the four true friends have attracted already a fourth generation of readers. Fifinka is the first character to appear on a stamp. Stamps with the three 'boys' (Bobík the Pig, Myšpulín the Cat and Pinďa the Rabbit) are to follow.
As a true scientist, Myšpulín, the second of the four Čtyřlístek comics characters featured on a stamp, creates a chemical reaction setting off a firework of flowers coming out of the heated flask. Stamps with Bobík the Pig and Piňda the Rabbit, the other two 'boys' of the four Čtyřlístek characters, are to follow.