Compare a similar vase in the Exhibition of Chinese and Other Far Eastern Art Assembled by Yamanaka & Co., New York, 1943, no. 915.
J. Ayers illustrates a larger version without a mark in the Baur Collection - Chinese Ceramics, vol. 3, Geneva, 1972, no. A 289, where he notes that "kiln transmutations (yao pien), liable to occur during the firing of the copper-red glazes were first exploited during the reign of Yong Cheng, when attempts to imitate the effects of ancient Chun wares were made; when in some cases - as here - the process was assisted by adding splashes of cobalt".