Nice find. Your paperweight is of Bohemian or German origin from about 1880-1910. Generally, collectors say it is from Silesia which is in the region where Poland, Germany and the Czech republic come together. If you have von Brackel's book Paperweights - Historicism - Art Nouveau - Art Deco , you can compare it to figure 137 or some of the others in the book.
As for value, a New York dealer once offered me a dozen for $26, but he was only joking. von Brackel sets the value in the $300-400 range, but I think a more realistic value is $150 to $200.