Silverplate Marks?

Hi
I have 6 dessert spoons that are 18.3cm long and which I believe to be silverplate. I have tried to identify the maker, WG S but got nowhere!
One of the spoons has a 4-pointed star? and a letter “C”, (see photo).
Five of the spoons has a 6-pointed star and the letter “P” or “R”, (see photo).

Are they silverplate? Any idea who the maker may be and what date they are?

Grateful for all & any help!
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Believe those silverplate marks were used by William Gallimore & Company of Sheffield England from about 1863 to 1891.
The firm became William Gallimore & Sons in 1891.

Thanks for the info, Snuffer