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Victorian London - Directories - Dickens's Dictionary of London, by Charles Dickens, Jr., 1879 - "Envelope Addressers"
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Envelope Addressers.— G. S. SMITH & Co., 220, Gresham House, Old Broad-street, EC. 7s. 6d. per 1,000 HORNCASTLE’S CENTRAL ADVERTISEMENT OFFICES, 61, Cheapside, 7s. 6d. per 1,000. STAFF & CO., 2, Soho-square, W.C 5s per 1,000. N. SYMONS, 45, Essex-street, Islington, N., 3s. 6d. per 1,000.—(See also COMMISSIONAIRES.)
Charles Dickens (Jr.), Dickens's Dictionary of London, 1879