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American firm English Silver Manufacturing Corporation, Brooklyn, New York. Founded c.1950, in business at least into the mid 1970's. Had some kind of relationship with Leonard Silver Mfg. They only produced silverplated items.
This is not silver from England.
There are many sets of silver plated tea services for sale. Values are minimal. Too much trouble keeping it shiny; needs frequent polishing.
I went to eBay, Completed Sales, and for non-antique (your set is 30-50 years old) tea sets the lowest price (sold) was $21. and the highest price was $79.00.
If you plan to sell it you'll need to polish it first. Tarnished modern sets don't sell. Expect to spend 2-3 hours polishing it!
Karie, If it is not engraved or stamped "Sterling" or "925", then it is not SILVER. The company only made "silverplated items."
Magnets stick to ferrous metals (iron, steel). Silver plated items are usually done on non-ferrous metals like copper, tin, brass. And silver also is non-ferrous (magnets don't stick to it).
I'm not sure how heavy "very heavy" is or what is has to do with your set. How much does silver plate weigh? How much does sterling silver weigh?
Sorry I don't have better news. I avoid buying all silver-plated items. Yet some stores buy all they can find.
You don't really need to polish it if you intend to sell it. The shabby chic crowd actually prefers the tarnished patina.