The style of painting on this bowl is quite unusual, but can be seen on a shard of a bowl with similar cobalt and amber decoration, illustrated in the transcript of Wang Liying's lecture, The Ancient Chinese Ceramics Research Society, TOCS, vol. 69, 2004-2005, p. 20, fig. 3b.
The result of Oxford Authentication Ltd. thermoluminescence test no. P107x43 is consistent with the dating of this lot.