This refined antique brooch is by Jacob Tostrup of Oslo, Norway. Made of sterling silver, it features a lovely cutout border and is finished with vitreous glass (kiln-fired) enamel; the border is accented with a pretty shade of blue, while the center disk has a pale yellow translucent color over a basse-taille floral surface that has hand-painted touches of red, green, and lavender.
Measuring 1 3/4" diameter, the unusual brooch is in excellent condition. The back has a simple c-clasp and is signed "925S" along with Tostrup's familiar tankard mark.
Item ID: 11041203