Interesting piece. However, Russian silver has operated on a standard of more than 750 parts per thousand, and Faberge, never used silver content so low.
None of the Nordic countries at the time indicated by the design seem to have hall-marked below a level of 800ppt, and few books seem to indicate otherwise. Searches on eBay attribute, without documentary evidence.
Nice, very nice enamel work but..... sorry cannot help further,
Marcus