Need help identifying this mark

British Silver Reading Silver Hallmarks
1

I have 4 Gorham salt cellars I tried to research the mark but can’t figure it out. It has an anchor with letter N in it and number 57 at the bottom. What does an anchor with an N means? Thanks for all the help…
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WILLIAM NOST COMPANY INC. - New York, NY. William Nost Company Inc, sterling silver holloware maker. Succeeded before 1922 William Nost (a New York silversmith).

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