Clay pipe, pipe bowl, double conical, unnoticed, green glazed, clay pipe smoking equipment smoke floor earthenware ceramics earthenware lead glaze, pressed in shape finished baked Early clay pipe with green glaze. Unnoticed. Double conical in shape. Radial ring under the lip of the top edge along the entire circumference. Glaze was probably accidentally leaked on the pipe during the baking archeology metropolis Rotterdam Stadscentrum Stadsdriehoek Oostplein earthenware smoking tobacco soil discovery underground pit Oostplein 1976