Art Deco,but where assayed,when and by who?

I am trying to identify the assay stamp and date letter on this Art Deco watch,I know its been engraved Xmas 1935,but the date letter may be different? Also the 2nd set of stamps D(?) 925 WB have drawn a blank.Any information would be gratefully received as I’m stumped[/img]
hallmark shot.JPG

The marks above Xmas are Dublin import marks for 1935.