Could someone help identify a hallmark

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?

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.