Sheet of paper made with very complex watermark by Brewer & Smith's patent method of a steel die pressing out a sheet of brass. The watermark advertisement contains an overprint: "By Royal Letters Patent, Granted Feb 12, 1849, Brewer & Smith's Newly Invented Bank Note Watermark, Malcolm Work, Clapham, Surrey, Inimitable." Sheet of paper made with very complex watermark by Brewer & Smith's patent method 1849