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The mark appears to read 'EPGS' (Electro Plated German Silver). German Silver was the name given to a nickel alloy used as the base for electroplating. The name fell into disuse following the outbreak of WWI.
Just to confirm the dating of the dropping of the term 'German Silver', here's a newspaper report from 1915:
We are so anti-German in London; according to that astonishing sheet, the "Leipziger Neueste Nachrichten." that the citizen who dares to ask for a German silver shaving-pot is in danger of his life. The authority is a "Swiss citizen"-the Charlie Chaplin of the German Press : "A Swiss citizen who was formerly in German employment in South-West Africa, and who has just arrived in Germany with his German wife, has favored us with some interesting descriptions of London in war time. "He relates that an all-consuming anti-German fever has overtaken Londoners. The mere utterance of the word "German" renders one liable to suspicion and arrest. An acquaintance -an Englishman by birth-who asked a silversmith to sell him some articles in "German silver' was ignominiously kicked out of the premises by a shopman bespattered with mud by an infuriated crowd.
Source: The Globe and Sunday Times War Pictorial - 25th December 1915