Woodbridge Antiques has dated this piece to the 1950s.
On the reverse you can find the marks for the renowned Norwegian jewellery designer Aksel Holmsen, and 925S showing the brooch is in sterling silver.

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The fastening pin works well
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Condition: In super pre owned condition.
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Period: Mid century.
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Measurements: Height: 3.2 cm Width: 3.2 cm Weight: 8.6 grams
Weights and measurements are approximate.
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Stock code 41922
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