Antoinettes Heirlooms has dated this Silver Guilloche Enamel Brooch to the 1900s.
Manufactured by SB&SLtd namely

However the hallmark on the reverse of the brooch is clearly for 1900 and the London Assay office.
The sharp reposes female profile is bordered by blue guilloche enamel.
The enamel is in overall very good condition … with some minor rim nibbles
Approx 3cm diameter
The overall quality of this genuine “Art Nouveau” piece is exceptional and a rare find
Antoinettes Heirlooms has dated this Silver Guilloche Enamel Brooch to the 1900s.
Heirlooms , past, present and future
You can view the stock and full dealer information on the Antoinettes Heirlooms Profile Page