As we all know the noble russians, especially in the St.Petersburg had also an affection towards the western style. We see this in all silver be it tea sets, bread/fruit baskets, candlesticks etc. made in russia during this period. The in addtion to this the russian style was developed in addition during the second half of 19th century but they lived side by side.
I am not a spoon collector so my knowledge can be limited on this area. However I have to say that I don't see a difference in the spoon compared to other spoons made in Russia during this period. Here are examples of other spoons made by FabergÃ©, Grachev and the Ovtschinnikov. You can always say that these are not authentic but the one which is a drawing of the FabergÃ© spoon is from the catalog shown on this site. As said I don't see any difference in the pattern which I believe is called the fiddle pattern which one of the classical ones. I have also other spoons with the same pattern and made by other russian masters. Also I have seen numerous engravings with western name initials on russian spoons and I don't see it a fact for saying something not authentic based on it. There is a difference if the there is writing on the item which can often be in russia.
If you Zolotnik have the possibility to enlarge the Ovtschinnikov mark shown by you it would be helpful to compare them. It seems that the double headed eagle is of about the same size in your picture meaning quite big.
Zolotnik you have a tremendous knowledge on russian silver and I agree otherwise with your text but sorry as I am not of the same opinion on the authenticity but we can agree to disagree on this.