I think it's silverplate and by William Adams: https://www.925-1000.com/silverplate__Init_W.html
"WILLIAM ADAMS INC.
Founded in 1865 by William Adams, the firm was active in Birmingham and New York. Much of its production was exported, especially to the United States. The McKinley Tariff Act of 1890 made mandatory the indication of the country of origin on products imported into the USA. From 1921 was mandatory the indication "MADE IN..." (but makers introduced this practice since the early 1910s).
From left to right the evolution of William Adams' mark:
GREAT BRITAIN (an unusual mark), possibly 1890s-early 1900s
MADE IN ENGLAND, after 1920"
Source: http://www.silvercollection.it/dictiona ... marks.html