Soviet Belarus hard plastic folding chess board 5 cm square - Minsk chess box vintage

This board is from Soviet plastic chess made in the Belarusian SSR, in the city of Minsk. The name of chess is called by some people "Ballet". This is a good chess board with white and cocoa-colored cells.

There should be a shape for chess pieces inside. It is missing.

Size: 42x42 cm.;
Square is 5 cm.;
Weight is 1.3 kg.