That is not modern glass. What you have there is an early molded glass fortune ball filled with embedded gold-toned number rings — exactly what the original Crystal Ball parlor games used around 1900–1915.
“Made in Czechoslovakia” gives us a firm date range and confirms this is authentic Bohemian crystal, not a later plastic or novelty ba
Czechoslovakia existed under that name from 1918 to 1938.
So your crystal ball was made in that 20-year window — most likely 1920s–early 1930s.
Bohemia (now Czech Republic) was the world center of crystal glass. These balls were exported to the U.S. and England for:
Your numbered, embedded-ring ball is a Bohemian novelty glass sphere, made specifically for fortune games.