雍正朝書四字年款盃，極為珍罕少見，此類單色釉瓷，造型色彩雖簡樸，燒造制作上卻極具挑戰性，制胎、施釉及窯燒均須絕對精準，這樣精巧的器物上，即便是極小的瑕疵，猶是會在出窯時作廢不用。

        This kind of monochrome glaze porcelain, though simple in shape and color, is extremely challenging in firing and production. The production of the wheel, glazing and kiln firing must be absolutely accurate. Even if there is a tiny flaw on such exquisite ware, it will become useless when it comes out of the kiln.