Large stoneware marble with salt glaze, almost round, marble ball toy relaxant soil find ceramic stoneware glaze salt glaze, hand-turned glazed baked Large stoneware marble covered with gray salt glaze, here and there light brown flamed. Almost round marble slightly ovoid Blutsen indicate possible use as marble archeology Rotterdam Kralingen-Crooswijk Struisenburg Bosland indigenous pottery import child play marbles child's play militaria militia to excercise Soil discovery: found in Bosland Rotterdam.