The semi-lustrous olive-brown glaze on this striking vessel, commonly referred to as 'teadust', first appeared in the seventh century and gained popularity during the Song, Jin and Yuan periods. Such glazes are a variant of dark-brown glazes, created through the slight underfiring of the wares.
A similar jar with a slightly wider mouth opening is illustrated by R. Krahl, Chinese Ceramics from the Meiyintang Collection, vol. 1, London, 1994, no. 443, where the author describes the fine speckling in the glaze as being "lighter tea-dust suffusions". See, also, the similar jar illustrated by B. Gyllensvärd, Chinese Ceramics in the Carl Kempe Collection, Stockholm, 1964, no. 266. Another example from the Falk Collection was sold in these rooms, 20 September 2001, lot 76.