Very rare design in a cerulean blue hue.
A similar example can be seen in the book, GEORG JENSEN JEWELRY by Isabelle Anscombe, Yale University Press, pg. 290.
Biography Bente Bonne was a Danish glass engraver who won numerous awards including the Ole Haslund’s Award, participated in many exhibitions including The International Exhibition of Glass Craft in Japan, and New Glass In Europe, held in Dusseldorf, Germany, and worked on a number of enamel and glass pieces for Georg Jensen. Primarily her works were of jewelry, and her use of enamel was a rarity within the Silversmithy's production. Excerpt from Georg Jensen Silversmithy - 77 Artists, 75 Years by Renwick Gallery