Mucha and Czechoslovakia's først postal stamps

Hradčany Castle
Stamp designed by Mucha
When Czechoslovakia gained independence after World War I, It was Mucha who designed the country's first postal stamps.
The motive was  Hradčany Castle.
We have been to Prague a couple of times and visited the castle. One year (1991) I bought pop up cards as a souvenir.  This one depicts the castle and is from my diary:

Pop up card, Hradčany Castle
Czechoslovakia Post has also issued a stamp to commemorate Mucha and the country's first stamps.

The pictures of the stamps are from Colnect. Colnect is a sort of wiki for collectors, where you can manage your collection and at the same time automatically compare your swap lists with other collectors.