Here is an outstanding Sterling silver gilt red guilloche enamel brooch by the illustrious Norwegian silversmithy of Jacob Tostrup, founded in Oslo in 1832. Notable 20th century descendants include the silversmiths Jacob Tostrup Prytz and his daughter Grete Prytz Kittelsen.I believe this brooch is one of her designs.
Condition: Excellent, no visible damage. C-clasp
Marks: Sterling, J.Tostrup, Norway
Size: 5 cm (2")