Help with Maker's Mark, 1781 Silver Serving Spoon, Please.

British Silver Reading Silver Hallmarks
1

This may be a long shot but can anyone offer any clues to the maker’s mark on this 1781 spoon. I have tried my best with the photos. I can make out a W over an R. Not sure if these are the 1st letter of 2 x double letter makers marks, ie W? over R?. Also not sure if there is an I between the W and R.
Any & All help appreciated!!

Cheers, John
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2

I have absolutely no idea at all. There doesn’t seem to be anything in Grimwade which matches.

3

Thanks.
It may be just a W over an R (without the I).

4

There aren’t even any like that. The only mark of that form which I know is W over S (William Scarlett) from c1720.