Woodbridge Antiques has dated this piece to the 1950s.
The back of the brooch has marks for Hroar Prydz - Norway Sterling 925s.

A dazzling brooch - great for a collector of vintage Norwegian designer jewellery.
Condition: Great pre-owned condition. The enamel is in beautiful condition.
Period: Mid twentieth century.
Measurements: Height: 5.2 cm Width: 5.2 cm Weight: 18 grams
Weights and measurements are approximate.
Woodbridge Antiques has dated this piece to the 1950s.
Specialists in quality antique silver, fine jewellery & accessories
You can view the stock and full dealer information on the Woodbridge Antiques Profile Page