Help with markings

Hi everyone,

I was wondering if anyone could identify the following markings?

The first is on a large oval platter.

The second is on a silver plated spoon handle. The last one appears to be a castle in an oval shape under a magnifying glass but not sure.

I have done a lot of looking and just can’t find anything on them.

Thank you in advance!

Merry
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Full picture of spoon handle
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JD&S are James Dixon & Sons of Sheffield. I can’t identify the makers of the handle.