Woodbridge Antiques has dated this piece to the 1920s.
There is a loop at one side for attachment.

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Condition: In very good condition. There are some very light impressions left to the top of the lid where an engraving has been removed in the past, but hardly noticeable, which we mention for complete accuracy.
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Measurements: height: 4.6 cm Width: 4.7 cm Weight: 22.1 grams
Weights and measurements are approximate.
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Stock Number 40494
Woodbridge Antiques has dated this piece to the 1920s.
Specialists in quality antique silver, fine jewellery & accessories
You can view the stock and full dealer information on the Woodbridge Antiques Profile Page