Woodbridge Antiques has dated this piece to the 1910s.
The case has clear hallmarks visible on the inside lip of the Vesta for Birmingham Assay Office, with a date mark for 1910 and the lion passant indicating sterling silver, along with the silversmith's maker's mark for Joseph Gloster Ltd.

Very lovely design and in great antique collector's condition.
Hallmarks and maker's marks: Birmingham 1910 by Joseph Gloster Ltd
Measurements:
4.2 cm x 3.6 cm (inc. loop) x 9 mm approx.
Weight: 19.7 grams approx.
Woodbridge Antiques has dated this piece to the 1910s.
Specialists in quality antique silver, fine jewellery & accessories
You can view the stock and full dealer information on the Woodbridge Antiques Profile Page