Woodbridge Antiques has dated this piece to the 1910s.
The brooch is marked Sterling Silver 1085 to the reverse, with the makers mark for J Aitkin & Son. There is a good fastening pin on the back.

A dazzling brooch in a really gorgeous green. Great for a collector of butterfly brooches.
Condition: Great pre-owned condition. The beautiful enamel is in super condition.
Period: Art Nouveau
Measurements: Height: 2cm Width: 3.8 cm Weight: 4.7 grams
Weights and measurements are approximate.
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