Antique Jacob Tostrup Bird Brooch Sterling Guilloche Skonvirke PinThe exquisite enamelwork of Norwegian silversmith Jacob Tostrup is exhibited in this beautifully rendered sterling silver Art Nouveau brooch depicting a bird in flight over a scenic waterway, circa mid 1800s. The finely crafted antique "skonvirke" pin is comprised of a heavy gauge sterling silver with guilloche enamel, glazed in colors of sky and navy blue, turquoise and white, and protected with a vitreous glass finish. The elegant brooch measures