Digby Antiques (Wiltshire) has dated this piece to the 1910s.
The top cover pulls off and is fully hallmarked for London 1911.

Most likely to have been from a travelling vanity set.
Super condition.
The lid weighs 2.09 ozs 59.3 grams. Not possible to weigh the base as this houses the brush and mechanism.
Length 10.3 cm
Width 6.5 cm
Depth 1 cm
Digby Antiques (Wiltshire) has dated this piece to the 1910s.
You can view the stock and full dealer information on the Digby Antiques (Wiltshire) Profile Page