I have a small batch of these German made Contemporary marbles from a consignor. A few large ones as a few more smaller ones for your consideration. My consignor went to Germany and purchased this series direct from the Elias Glashutte Shop in Lauscha. The smaller pieces are signed and dated but the larger are not. These were all made by Rolf (somtimes seen as Ralf) Grenier-Adams (yes, related to the famous Grenier, the inventor of the marble cane cutting shears