Through looking at the hallmark and searching the information on this site I believe that it is from the chester assay office and made by Synyer & Beddoes.
It appears to have the letter z, S*B, lion, two what look like wheatsheafs either side of a sword and next to this another mark which is not at all clear.
I would love to know the date and any information about the markings if anyone can help.

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