Mr. Winfield was one of the first, if not the very earliest, to apply the stamping process to the production of cornices, cornice-pole ends, curtain bands, and other similar goods. The singular purity of colour which, by skilful "dipping" and lacquering, he was able to produce, at a period when such matters were little attended to, secured for his goods a good deal of admiration and a ready sale. At the time of the great Exhibition of 1851, the goods he exhibited obtained for him the highest mark of approval--the Council Gold Medal. The Jury of Experts reported, in reference to his brasswork, that, "for brilliancy of polish, and flatness and equality of the 'dead' or 'frosted' portions, he stood very high; and that in addition to very perfect workmanship, there frequently appeared considerable evidence of a feeling for harmony and for a just proportion and arrangement of parts." It is also mentioned that "in the manufacture of metallic bedsteads he has earned a deservedly high reputation." In addition to his brassfoundry trade, he gradually added the manufacture of brass, copper, and tin tubing, gas-fittings and chandeliers, iron and brass bedsteads, ship's fittings, brass fittings for shop fronts, and general architectural ornamental metal work of all kinds. He afterwards purchased the large establishment near his own works, called the Union Rolling Mill, where he carried on a very extensive wholesale trade in rolled metals of every kind, and brass and copper wire of all descriptions; and he was, for forty years, largely engaged in the coal business. For a very long period Mr. Winfield was the sole proprietor of the extensive business he had created. He was assisted by his only son, Mr. John Fawkener Winfield, whose promising career was cut short by untimely death. This was a blow from which Mr. Winfield never entirely recovered. He soon afterwards took into partnership his relative, Mr. C. Weston, and his old confidential clerk, Mr. J. Atkins. His health began to fail about this time, and he retired from the active control of the concern, retaining, however, his position as head of the firm until his death.