Fragment stoneware jug be decorated with blue and gray glaze, entirely in relief, jug crockery holder soil find ceramic stoneware glaze salt glaze cobalt tin metal, hand-turned glazed fried Fragment stoneware jug. neck shoulder and belly fragment with pewter measuring pin at the bottom of the neck Gray shard archeology Rotterdam City center Stadsdriehoek uitheems pottery import drinking pour serving Schielandshuis Soil discovery: Schielandshuis during restoration 1982.