In mint condition, this lovely bright blue enamel on sterling silver pin and earring set was made in Norway by the artist, O.F. Hjortdahl. We have been unable to determine this artist's dates of production. This set is certainly in the modernist genre of David Andersen, Oystein Balle, etc. so I would guess the age to be 1950s-70s. The brooch measures 1 15/16ths (1/16th under 2") x 1 1/16th". C-clasp on the pin and clips on the earrings. The earrings measure approx. 3/4" x 3/4".