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Thank you for your help. Sterling silver pre-1820 is more my specialty. I did think that Sheffield was being used to denote that it was plate, or that maybe it was from a factory in that area, like a city hallmark. I did not think of an American company using that term though. What is the company you are thinking of?
I am working at a historic property where the candlesticks most likely would have been purchased in the 1880s. However, there have been multiple generations living here so they could have been purchased later or inherited from earlier. The family is from New England but they were wealthy so they did travel to Europe (where they went on a shopping spree, and had a home in New York City. You might find this interesting that J. Alden Weir, the original owner, was friends with Louis Comfort Tiffany.