Help identifying maker's mark

[Lou1955]

This gravy boat has the marks for sterling, 1784, and London, but I cannot find the maker IW in the form as seen here and from that period. I've included a picture of the crest (which I believe is that of the Graham clan) on the front of the boat. Thanks.

[silvermakersmarks]

This mark does not seem to have been recorded by Grimwade so it is possible that it was registered in the now-lost 1758-1773 Largeworkers' Register and that we will not be able to identify it. Unless of course anybody else has any ideas......

Phil

[SteveDWollongong]

I too have just been through Grimwade with the same result and also think the lost register....

Cheers,
Steve