I got this spoon set quite a while ago (can't remember the price) and It has this sign/marking on it that I have no idea at all what it means or where it's from.
There are no other marks on the entire spoon set. Not even on the box. I've gone through the thing several times. So I don't have any better markings sadly. The marking that you see up there is from the sugar tong.
Well i know there are some sites online that specialize in domestic silver, they can help you if you give good clear pics of the entire spoons/s and the tong . I apologise for not having a link for you - trust me they are there . I'm guessing they are Russian or Scandinavian ,early 20th C.