PIEL
FRERES
Art Nouveau Brooch 
Gilded metal
Length: 3cm. Width 3.3cm
French. Circa 1900
Fitted
case
Literature: cf. The Belle Epoque of French Jewellery,
1850-1910, page 273.
The Paris Salons 1895-1914, Jewellery, Alastair Duncan, 1994,
Volume II: The Designers L-Z, page 157-160
The pendant version, exhibited at the Exposition Universelle,
is illustrated on page 160