www.925-1000.com

That is always a difficult question to answer. Costly to who? To the average person, probably only mildly so -- Bradbury sold a great deal of such goods to judge by how many pieces I see on a monthly basis and Newburyport was a good-sized, but by no means large city. It was, however, quite a prosper...

see here:
Bradbury
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Can you make out the letter preceeding Parker in the mark? Is it a C?
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Sunderland & Weaver were the successors to C. A. Burr & Co of Syracuse NY. Active as retail jewelers and merchants c 1865-1880.
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Freidman Silver Company of Brooklyn NY; established 1980, bought by Gorham in 1960.

I would say the inscription is a fair guess and in keeping with the stylistic motif you describe. Short of a miracle, you will not do better than that -- the vast majority of American silverplate is impossible to date nearer than a decade or more. I would guess, given the wood lining and size, that ...

Not Gorham; the mark is Barbour Silver Company, founded in 1892 at Hartford CT. They were known for their repossee silverplate, often depicting dutch life of the 18th century.

See here:
http://freepages.genealogy.rootsweb.com/~silversmiths/makers/silversmiths/185929.htm
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The patent date on your spoon image is 28 August 1900; the firm stopped making flatware some time before 1908, hence it was made sometime in the last 8 years of a 68 year history.

Simons Brothers of Philadelphia, founded in 1840. They sold off their patterns and dies to Alvin Manufacturing in 1908, so your piece is near the end of company-based production. The firm was still in business in the 1980s.

Frederick J. Posey, working c 1820-1840 in Hagerstown MD and after that in Shepherdstown VA.
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Towle's "Paul Revere" line of flat and hollowware. Your second image (showing the pattern, I presume) does not exist. If you fix it, one of those with a knowledge of the firm's goods may identify it for you.

The lion standing inside a script T is Towle's mark.

Locke was the retailer; the maker was Towle.

Just wondered if it was you who won the auction and if you have permission to use the photos. . .
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E. G. Webster & Son

Coin silver, not sterling. C 1830. New York.
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Well, to be blunt, your picture with the marks is useless, but it looks like ordinary die-stamped junk from Asia. A small effort at homework before listing would have been in order.

silverplate.

Christofle of Paris; silverplate.