Sitzendorfer Porcelain Works (formerly Voigt Brothers) by: George
Hello had a look at that mark not 100% sure but it does look like Sitzendorfer from germany
edit **As Peter (admin) mentioned in his answer to the original query there were several makers in the same region using the 'S' with crown - see the maker Voigt Brothers of Sitzendorf which went onto become the Sitzendorfer Porcelain Works**
hope this helps you in your search regards George
Crown over S by: Anonymous
You are exactly right about this mark being from Carl Scheidig.. This mark and others are on the PM&M website under: Germany / Thuringia / Gräfenthal