An unusual diamond set gold abstract design brooch by Oskar Pihl

An unusual diamond set gold abstract design brooch by Oskar Pihl, each graduated yellow gold spray terminates in an old circular cut diamond. Stamped OP and 56. The gold pin stamped OP and with two unidentified marks (one possibly for St Petersburg). Scratched with inventory number possibly 10210. 2.7cm wide. In fitted wooded box, the silk lining stamped in cyrillic for K. Faberge, Moscow and St Petersburg, all beneath the Imperial arms.