Corvidae Antique has dated this piece to the 1910s.
You can find examples which originate later into the 20th century but they are much less fine and often cast in pewter rather than silver.

The brooch is not signed; it's akin to pieces by master Norwegian jewellers Marius Hammer, Astri Holthe and Henrik Moller, it's certainly the work of a fantastic craftsperson!
SIZE: Approximately 5cm diameter.

WEIGHT: 16.1g.
MATERIALS: 830 silver.
HALLMARKS/STAMPS: Stamped 830 with a crown.
CONDITION: Excellent antique condition. We have not overpolished so as to preserve the brooch's unique patina.
ERA: Estimated Arts and Crafts (c.1880s-1910).
Corvidae Antique has dated this piece to the 1910s.
Hand picked jewellery from a friendly family business
You can view the stock and full dealer information on the Corvidae Antique Profile Page