It seems this mark is still a mystery. In looking at another silver site, I came across a pair of sterling decanter labels. The seller states that they are both marked sterling and one (Port) has the “-W-” mark like the shell bowls and the other (Scotch) although the same style is marked with a W in a shield. There is no image of the marks.
Here is the link: sipler-sterling.com/Sterling … page3.html
I looked for marks with a W in a shield and came up with J. Wagner and Sons but that mark doesn’t match the marks on the silver shell dishes.
Anyone have any thoughts with this new info?