This sweet little butterfly is two-toned green guilloche enamel 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.