I've just bought a Wilkinson's Sword sgian dhu as part of a collection on eBay. All I can find out is that it was a limited hand made run that no longer being produced. The ebay pic was of the collection and didn't single out this knife, which is what I bought the collection for: it included a Paul Chen dirk, too.
Does anybody have any links for pictures of this sgian dhu? It will be here later in the week.