Antique Pairpoint Quadrupleplate Covered Butter Dish produced in New Bedford, Mass. hallmark c. 1890s. Thomas Pairpoint(1838-1902) founded Brittania Co. in Meriden, Conn. moving to New Bedford as Pairpoint Mfg Co. supplying Mount Washington with most of its Silverplate and Quadrupleplate for its glass products. This hallmark is around 1890s, the weight is 1 lb 2.3 ounces, height 6 inches, width 6 1/2 inches. The quadrupleplate is in excellent condition without any copper showing, and no major dents or repairs ,that I can see, the inner plate has some bubble areas that appear as production voids rather than damage or oxidation.