Compare the similarly proportioned meiping of this type and date, also painted with birds, from the collection of Robert M. Ferris IV, illustrated by R.D. Mowry, Hare's Fur, Tortoiseshell, and Partridge Feathers; Chinese Brown-and Black-Glazed Ceramics, 400-1400, Harvard University Art Museums, Cambridge, Massachusetts, 1996, pp. 161-3, no. 53. The author notes that bottles of this type, known as xiaokou ping (small-mouthed bottles), were probably sealed with a fabric-wrapped wooden dowl and were used for storing wine and other liquids.