Kingsdown Antiques has dated this piece to the Victorian era.
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Measurements:

Length: 8 3/4" (approx 21.75cm)
Box height: 1" (approx 2.5cm)
Length: 10" (approx 25cm)
Width: 2 1/2" (approx 6.25cm)
Silver weight: 41g
Total weight: 150g
In good condition - any dark areas are shadows from the photography.
Kingsdown Antiques has dated this piece to the Victorian era.
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