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Many thanks! I think you are correct about the London date mark (1712-13). As to the maker, I will look further, but, again, your guess is a good one...

Can anyone help me to identify the hallmarks and date of manufacture of the silver marrow scoop shown below? The maker is either "SM" or, more likely, "WS". Two of the hallmarks are entirely abraded and one is partially abraded. I am enclosing photo herewith.