Walker and Hall Silver

I am a newcomer so I’m not sure if this is how to find what I need to find.
I have a coffee pot, cream and sugar made by Walker & Hall. I need to find out if it is silver plate or silver. I’ve added some photos that may help. If you know anything about this set please let me know.
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The marks are Walker & Hall’s electroplate markings so they are plate rather than solid. The Greek letter pi is a proprietary date code used by Walker & Hall. One of our contributors has published a key to these codes; he may be able to date your coffee set.