According to the Dutch "Het Archeologisch Basisregister (ABR), versie 1.0 november 1992" [1], Elp Kümmerkeramik is dated BRONSMA (early MBA) to BRONSL (LBA), standardized by "De Rijksdienst voor Archeologie, Cultuurlandschap en Monumenten (RACM)" to a period starting at 1800 BC and ending at 800 BC.