Could someone help identify a hallmark

Hi,
I have what I believe to be a cigarette case that I believe is silver but I can’t identify the hallmark and was wondering if anyone could help?
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Unfortunately it’s not silver. The maker is James Dixon & Sons of Sheffield and EPBM stands for ElectroPlated Britannia Metal. Britannia Metal is a pewter-like base metal alloy. The electroplating process deposits a very thin layer of pure silver onto the surface of this base metal.