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The number 800 tell us the purity of the silver used- which in this case was a 80% purity. To decipher the rest of the mark, I would need a picture of the mart and a picture of the piece, could you provide them? I will also need-approximately- the dimensions.
German hallmarking system was unified in 1888 adopting the national mark "crescent and crown" indicating in thousandths the fineness of silver. This system is still in use in present days. This information tell us that your piece is German. There are a lot of British manufacturer with initials WS, but the German one was not identified yet. I'm sorry for this, I would find other past auction sales of "WS german 800 silver" and they listed as unknown manufacturer-for example, in Bonhams, which is major auction house. We do known from the mark that it's German and that it was manufacturer in the early 1900s.
Regarding the value of your item, I have just perform a market research of similar sold items as yours. I performed the research based upon the most recent finished auctions and private sells, so the value given is the real market value of your item. This is the only way to know the exact value of your unit.
The value will be in the range of 1,000-1,600$.
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