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Both the form and glaze of this rare vessel marked a radical departure for the German ceramics industry in 1902.

Two years previously the Exposition Universelle in Paris had been a chastening experience for the potteries of Westerwald. Traditional saltglazed stonewares had appeared distinctly old-fashioned next to the sensuality of Art Nouveau.

By early 1902, eager not to repeat its failure at the Deutsch- Nationalen Kunstausstellung in Dusseldorf later in the year, Westerwald District Council turned to a group of avant garde designers to provide the zeitgeist.

This vase was among a series of sinuous organic designs created by the Belgian architect Van De Velde for a number of different local potters.

Most of these were produced in the traditional hues of grey and blue – such as that sold by Woolley & Wallis of Salisbury for £3000 in 2007 – but his most ambitious collaboration with the Reinhold Hanke factory succeeded in creating Westerwald’s first sang-de-boeuf glazes.

These experimental wares in striking shades of purple and red were frequently unsuccessful, and only a handful survive.

Examples of the distinctive two-handled vase – pictured in a room setting from the Deutsch-Nationalen Kunstausstellung in Dusseldorf – can be found in the Museum fur Kunst und Gewerbe in Hamburg and in the British Museum (a vase bought at Christie’s in 1986).

This example, standing 9in (23cm) high, carries an impressed manufacturer’s mark and the model number 2043.