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Jacob Tostrup Brooch Monster Beskyttet 1920s Art Nouveau Guilloche Enamel Jewelry

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Jacob Tostrup brooch. Monster Beskyttet 1920s art nouveau guilloche enamel pin is a special find indeed. Highly collectible, this brooch from the famed Norwegian jewelry firm of Jacob Tostrup if imperfect, is still a beauty. Tostrup jewelry was founded in 1832 and their guilloche enamel jewelry is considered to be some of the highest quality ever produced.

The term "guilloche" is named after the French engineer “Guillot”, who invented a machine that would scratch intricate, fine patterns and designs on metallic surfaces.The technique for jewelry making involves carving a design into a base metal. After this carving, the guilloche pattern could then be filled with different colors and opaqueness of enamel paint. During the process, translucent enamel or fused glass is applied over a metal surface which has been engraved in some way - very often with a spirograph design.

This brooch exemplifies their skill and artistry; it features a flowing Art Nouveau design in four different colors, cobalt, chartreuse, green and purple and likely dates from 1900-1920. It is stamped "J Tostrup 923S Monster Beskyttet" on the back. It closes with a period correct 'C' clasp. Condition is good to excellent, the fused glass does have small scratches and the "c" clasp is a little tough to close. Close up the scratches are evident but while the pin is worn they are not visible.

Dimensions are approx"
2" in diameter, 1" in height

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Jacob Tostrup Brooch Monster Beskyttet 1920s Art Nouveau Guilloche Enamel Jewelry


  • Vintage item from the 1920s
  • Materials: metal, enamel, glass, pin
  • Only ships within United States.
  • Feedback: 677 reviews
  • Favorited by: 24 people