This is the mark of English Silver Mfg Co of Boston, Massachusetts and Brooklyn, New York. This is a silver-plated tray (not sterling)
that was made between the 1950-1970 time period based on this hallmark on the bottom. They were in business from 1952 to 1990.
The tray has a current value of $35.00 retail.Some sites that I recommend for selling are Varagesale.com, Ioffer.com, OfferUp.com, Ebay and letgo.com.
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