This is a complex but interesting job.
National Bank of the Czech Republic 2021 Decided to issue a gold bar to commemorate the most popular paper money in 1961.
100 Crown Banknote 5OZ AG+1KG AG+

In 1960, the Czechoslovak National Bank exhibited 38 100 kroner banknotes. The winning design was selected by the public and achieved unexpected success.
100 crown note is one of the most beautiful and famous notes in Czechoslovakia's history. This note was printed in 1961 and circulated until 1993.
This is the longest paper money in Czechoslovakia's history.

I designed this 3D model for the Samlerhuset group