OSCAR DIETRICH
Secessionist Brooch
Silver with opal
Marks: ‘OD’ 'A' & Vienna poincon
Length: 1.6 cm   Width: 2.7 cm
Austrian. Circa 1910
Fitted case
The design is attributed to Franz Delavilla
Literature: cf. Art Nouveau Jewelry, Vivienne Becker, 1985, pl. 220
Wiener Gold - und Silberschmiede und ihre punzen 1867-1922
Waltraud Neuwirth, Lexicon A-K , p. 143 & 237