Andrew Nethercott Antiques has dated this piece to the 1890s.

The separately made enamelled bird is pinned in place on the back next to the makers mark E&B
Some surface wear to the black enamel, otherwise in very good, bright, sound condition, ready to wear.
Guaranteed solid silver and gold.
Diameter 1,1/2" or 36.7mm, weight 8.4 grams.
Andrew Nethercott Antiques has dated this piece to the 1890s.
Works of art, collectables, scientific and decorative antiques from the 17th - 20th century
You can view the stock and full dealer information on the Andrew Nethercott Antiques Profile Page