Fragment earthenware twin bowl, narrowed neck opening, container holder earth discovery ceramics earthenware glaze lead glaze, hand-turned glazed fried Half twin bowl without handle or handle Vaulted bottom narrowed neck opening Along the side wall rotating braces Red shard. Internal fully glazed on the underside sparsely glazed archeology Rotterdam City Triangle Groenendaal underground pit indigenous earthenware archaeological find in the soil Rotterdam underground pit Groenendaal (from canal dredger) 1976-09-20.