The pinnacle of the factory's output was the two intricately decorated "Rhinoceros" vases which were advertised by the works as being the largest single-piece porcelain objects in existence (one of which is in the Victoria and Albert Museum and the other of which is in the Clifton Park Museum in Rotherham) and a large exquisite dessert service commissioned for King William IV, which took eight years to complete, was eventually delivered to his successor Queen Victoria and can be seen at Windsor Castle.