Hallmark identity mystery

[nicktuele]

Can anyone identify these hallmarks on a vintage fork with mother of pearl handle?
https://imgur.com/a/ClqnsoK

[dognose]

Hi,

Welcome to the Forum.

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Trev.

[AG2012]

MAPPIN BROTHERS
Sheffield and London

Made before the crown (used by Sheffield Assay Office for silver) was prohibited on silver plate.
See here:
search.php?keywords=MAPPIN+BROTHERS+She ... and+London
Regards