This sweet little butterfly is blue guilloche enamel with black and white accents on vermeil, or gold over sterling silver. The pin is marked "Norway Sterling OPRO." (The founder is Ole-Petter Raasch Olsen; he purchased the Finn Jensen firm in 1976.) This piece dates after 1976. The pin bar and guard are gold-filled but not sterling. The little butterfly is 1/2" X 7/8" and the pin bar is 1 3/4" long. This stickpin is in excellent original condition.