The inscription on the base gives the instruction: 'sons and grandsons forever treasure', a reference to the phrase which often concluded the inscriptions on Early Zhou dynasty bronzes.
A similar pair of bowls and bearing the same mark from the Clague Collection is illustrated in C. Brown, Chinese Cloisonné - The Clague Collection, Phoenix Art Museum, 1980, p.122-123, pl.56, where other bowls of this type are listed from the Staatliche Museum, Berlin, and six in the Minneapolis Institute of Art.
Another smaller example (11.5 cm. diam.) in the Beijing Palace Museum collection is illustrated in Splendours of China's Forbidden City, the Glorious Reign of Emperor Qianlong, The Field Museum, 2004, p.198, no.242. A selection of these bowls displayed as part of a reconstruction of the emperor's banquet table is also illustrated, Op. Cit., p.202, no.250.
Compare also the current pair with another very similar sold in our Hong Kong Rooms, 28 November 2006, lot 1678.