Stoneware jug with incised decoration and cobalt blue, typical of Westerwald production in the second half of the 18th century.
Height: about 25.5 cm.
Good condition, very slight wear on the neck, the firing crack under the base does not appear on the inside.
For a similar decoration, see for example this teapot kept at the Victoria & Albert Museum: http://collections.vam.ac.uk/item/O162350/teapot-unknown/
See also the catalog of the exhibition of the National Museum of Renaissance in Ecouen : Bertrand Bergbauer and Aurélie Gerbier, Au grè du Rhin. La collection de grès allemands du musée national de la Renaissance, 2014, Cat. n°72.