Similar examples of this form are found in other materials such as the gold cup in Bo Gyllensvärd, Chinese Gold and Silver in the Carl Kempe Collection, Sweden: Nordisk Rotogravyr, 1953, no. 53A, pp. 110 and 111. A jade example is illustrated in Jadeware: Volume II - The Complete Collection of Treasures of the Palace Museum. Hong Kong, 1995, no. 113, p. 137.
The dating of this lot is consistent with the result of Oxford Authentication Ltd., thermoluminescence test, no. C109q36.