A Chinese Blue-Glazed Porcelain Dish Of circular form, the shallow sides supported on a short foot, incised with scrolling peonies to the front and reverse, covered overall in a deep blue glaze, a collector’s mark incised to the front, the glaze stopping short of the foot rim revealing the buff porcelain body, the recessed base with a four-character mark reading Yu Tang Jia Qi (Elegant Vessel of the Jade Hall) in underglaze-blue. Period: 16th/17th century. Diameter: 21.5 cm. Proveniens From the collection of Ragnar Sachs (1902-1973). Thence by descent.