Lions head erased on old silver plate holloware

trying to date this gem! The piece is heavy silver plate and very ornate serving tray. Here are the marks. The tiny marks under the 3 hallmarks are too small to make out if they are letters or symbols. I’m trying to find a date and perhaps maker Thank you
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I seem to recall that this mark has come up before, either here or on another forum, but is still unidentified.