How many copies did the original version of 1959 of the board game Risk sell?
I found this article stating that it sold more than 100,000 copies in its first year. However there are no sources given from where this information is from.
La Storia di Risiko! e l'Anello Mancante, book by Roberto Convenevole and Francesco Bottyone, estimated 40.000.000 copies sold worldwhide from the beginning to the release of their book, which was in 2002.