The Fabergé item was made 1895 and are indeed authentic (confirmed by specialists and auction houses), so there's no need to discuss the "authenticity" of the item as I only wonder about the monogram.
The monogram; first sight makes me think "WS/SW", at a closer look the "W" can be an "A", the "W" and the pattern can also be "JN", or "JSN". I think "W" can indicate "the third" as well? Does someone recognize this monogram? What or which person does it stand for?












