Woodbridge Antiques has dated this piece to the 1940s.
The pin fastens under a hook style catch.

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A lovely eye-catching brooch, the perfect gift for lovers of forties vintage!
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Condition: In good vintage condition with some very light surface scratches & marks commensurate with age. The hook catch is a little loose but holds well through clothing.
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Measurements: Width: 4.7 cm Height: 3.2 cm Weight: 11 grams
Weights and measurements are approximate.
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Stock Code 42021
Woodbridge Antiques has dated this piece to the 1940s.
Specialists in quality antique silver, fine jewellery & accessories
You can view the stock and full dealer information on the Woodbridge Antiques Profile Page