Jeff Sims Antiques has dated this piece to the 1910s.
The rectangular body has alternate stripes of enamel on both front and back. and is hallmarked to both body and attaching ring. A good collector's item, still usable today. Dimensions below.

Postage and packing £8.00 UK
£16.00 Worldwide.
Condition :- Good, with no splits or holes. There is one dig to the front on the silver, commensurate with age and use. -The enamel is in perfect and undamaged condition. The whistle works well.
Hallmarks :- Full set to body and sterling lion to ring.
Date :- London 1912.
Maker :- Stuart Clifford.
Length :- 3.75 cms.
Width :- 1.5 cms. (widest point).
Depth :- 0.5 cms.
Jeff Sims Antiques has dated this piece to the 1910s.
Specialists in antique silver, glassware and objects of vertu
You can view the stock and full dealer information on the Jeff Sims Antiques Profile Page